390611221 has 32 divisors (see below), whose sum is σ = 527788800. Its totient is φ = 280837440.

The previous prime is 390611171. The next prime is 390611239. The reversal of 390611221 is 122116093.

It is not a de Polignac number, because 390611221 - 2⁹ = 390610709 is a prime.

It is a super-2 number, since 2×390611221² = 305154251942221682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390611321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168015 + ... + 170323.

It is an arithmetic number, because the mean of its divisors is an integer number (16493400).

Almost surely, 2^390611221 is an apocalyptic number.

It is an amenable number.

390611221 is a deficient number, since it is larger than the sum of its proper divisors (137177579).

390611221 is a wasteful number, since it uses less digits than its factorization.

390611221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2340 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 390611221 is about 19763.8867887873. The cubic root of 390611221 is about 730.9958392435.

The spelling of 390611221 in words is "three hundred ninety million, six hundred eleven thousand, two hundred twenty-one".