393104

Appears in sequences

• Numbers k such that sigma(k) = 4*phi(k).at n=29A068390
• Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=34A068400
• Numbers of the form x = 2^k*p*q, p,q odd primes, such that sigma(x)/phi(x) = 4.at n=7A292422