1957797138 has 32 divisors (see below), whose sum is σ = 4370902272. Its totient is φ = 579474000.

The previous prime is 1957797137. The next prime is 1957797143. The reversal of 1957797138 is 8317977591.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1957797131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342088 + ... + 347763.

It is an arithmetic number, because the mean of its divisors is an integer number (136590696).

Almost surely, 2^1957797138 is an apocalyptic number.

1957797138 is an abundant number, since it is smaller than the sum of its proper divisors (2413105134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1957797138 is a wasteful number, since it uses less digits than its factorization.

1957797138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689910.

The product of its digits is 3333960, while the sum is 57.

The square root of 1957797138 is about 44247.0014577259. The cubic root of 1957797138 is about 1250.9959290628.

The spelling of 1957797138 in words is "one billion, nine hundred fifty-seven million, seven hundred ninety-seven thousand, one hundred thirty-eight".