1138857656 has 32 divisors (see below), whose sum is σ = 2195348400. Its totient is φ = 553532160.

The previous prime is 1138857653. The next prime is 1138857667. The reversal of 1138857656 is 6567588311.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138857653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86690 + ... + 98958.

Almost surely, 2^1138857656 is an apocalyptic number.

It is an amenable number.

1138857656 is a deficient number, since it is larger than the sum of its proper divisors (1056490744).

1138857656 is a wasteful number, since it uses less digits than its factorization.

1138857656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12599 (or 12595 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

The square root of 1138857656 is about 33746.9651376239. The cubic root of 1138857656 is about 1044.2948795876.

The spelling of 1138857656 in words is "one billion, one hundred thirty-eight million, eight hundred fifty-seven thousand, six hundred fifty-six".