1397857137 has 8 divisors (see below), whose sum is σ = 1864640736. Its totient is φ = 931489152.

The previous prime is 1397857129. The next prime is 1397857163. The reversal of 1397857137 is 7317587931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1397857137 - 2³ = 1397857129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1397857137.

It is not an unprimeable number, because it can be changed into a prime (1397857337) 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, 95968 + ... + 109569.

It is an arithmetic number, because the mean of its divisors is an integer number (233080092).

Almost surely, 2^1397857137 is an apocalyptic number.

It is an amenable number.

1397857137 is a deficient number, since it is larger than the sum of its proper divisors (466783599).

1397857137 is a wasteful number, since it uses less digits than its factorization.

1397857137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207807.

The product of its digits is 1111320, while the sum is 51.

The square root of 1397857137 is about 37387.9276906330. The cubic root of 1397857137 is about 1118.1178894036.

The spelling of 1397857137 in words is "one billion, three hundred ninety-seven million, eight hundred fifty-seven thousand, one hundred thirty-seven".