1557978404 has 12 divisors (see below), whose sum is σ = 2742789504. Its totient is φ = 774324264.

The previous prime is 1557978391. The next prime is 1557978427. The reversal of 1557978404 is 4048797551.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1165484 + ... + 1166819.

It is an arithmetic number, because the mean of its divisors is an integer number (228565792).

Almost surely, 2^1557978404 is an apocalyptic number.

It is an amenable number.

1557978404 is a deficient number, since it is larger than the sum of its proper divisors (1184811100).

1557978404 is a wasteful number, since it uses less digits than its factorization.

1557978404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332474 (or 2332472 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 50.

The square root of 1557978404 is about 39471.2351466229. The cubic root of 1557978404 is about 1159.2767995126.

The spelling of 1557978404 in words is "one billion, five hundred fifty-seven million, nine hundred seventy-eight thousand, four hundred four".