1257638132 has 24 divisors (see below), whose sum is σ = 2278036992. Its totient is φ = 606880800.

The previous prime is 1257638117. The next prime is 1257638143. The reversal of 1257638132 is 2318367521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32657 + ... + 59847.

It is an arithmetic number, because the mean of its divisors is an integer number (94918208).

Almost surely, 2^1257638132 is an apocalyptic number.

It is an amenable number.

1257638132 is a deficient number, since it is larger than the sum of its proper divisors (1020398860).

1257638132 is a wasteful number, since it uses less digits than its factorization.

1257638132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27599 (or 27597 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 1257638132 is about 35463.1940467860. The cubic root of 1257638132 is about 1079.4070052829.

The spelling of 1257638132 in words is "one billion, two hundred fifty-seven million, six hundred thirty-eight thousand, one hundred thirty-two".