1657318138 has 16 divisors (see below), whose sum is σ = 2870409024. Its totient is φ = 702956160.

The previous prime is 1657318133. The next prime is 1657318177. The reversal of 1657318138 is 8318137561.

It is a junction number, because it is equal to n+sod(n) for n = 1657318094 and 1657318103.

It is not an unprimeable number, because it can be changed into a prime (1657318133) 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, 608848 + ... + 611563.

It is an arithmetic number, because the mean of its divisors is an integer number (179400564).

Almost surely, 2^1657318138 is an apocalyptic number.

1657318138 is a deficient number, since it is larger than the sum of its proper divisors (1213090886).

1657318138 is a wasteful number, since it uses less digits than its factorization.

1657318138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220517.

The product of its digits is 120960, while the sum is 43.

The square root of 1657318138 is about 40710.1724142750. The cubic root of 1657318138 is about 1183.4101625358.

The spelling of 1657318138 in words is "one billion, six hundred fifty-seven million, three hundred eighteen thousand, one hundred thirty-eight".