1220656404 has 24 divisors (see below), whose sum is σ = 3107125728. Its totient is φ = 369895840.

The previous prime is 1220656379. The next prime is 1220656427. The reversal of 1220656404 is 4046560221.

It is a super-2 number, since 2×1220656404² = 2980004113252422432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4623567 + ... + 4623830.

It is an arithmetic number, because the mean of its divisors is an integer number (129463572).

Almost surely, 2^1220656404 is an apocalyptic number.

It is an amenable number.

1220656404 is an abundant number, since it is smaller than the sum of its proper divisors (1886469324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220656404 is a wasteful number, since it uses less digits than its factorization.

1220656404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247415 (or 9247413 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1220656404 is about 34937.8935255118. The cubic root of 1220656404 is about 1068.7213316341.

The spelling of 1220656404 in words is "one billion, two hundred twenty million, six hundred fifty-six thousand, four hundred four".