1555257992 has 36 divisors (see below), whose sum is σ = 2972163285. Its totient is φ = 762960960.

The previous prime is 1555257989. The next prime is 1555258007. The reversal of 1555257992 is 2997525551.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 1548107716 + 7150276 = 39346^2 + 2674^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=27886.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555257992.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8142617 + ... + 8142807.

Almost surely, 2^1555257992 is an apocalyptic number.

It is an amenable number.

1555257992 is a deficient number, since it is larger than the sum of its proper divisors (1416905293).

1555257992 is an frugal number, since it uses more digits than its factorization.

1555257992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 266 counting only the distinct ones).

The product of its digits is 1417500, while the sum is 50.

The square root of 1555257992 is about 39436.7594003361. The cubic root of 1555257992 is about 1158.6016622378.

Multiplying 1555257992 by its sum of digits (50), we get a square (77762899600 = 278860²).

The spelling of 1555257992 in words is "one billion, five hundred fifty-five million, two hundred fifty-seven thousand, nine hundred ninety-two".