1897907138 has 8 divisors (see below), whose sum is σ = 2916296460. Its totient is φ = 925808320.

The previous prime is 1897907101. The next prime is 1897907159. The reversal of 1897907138 is 8317097981.

It can be written as a sum of positive squares in 2 ways, for example, as 1657874089 + 240033049 = 40717^2 + 15493^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1897907138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11572523 + ... + 11572686.

Almost surely, 2^1897907138 is an apocalyptic number.

1897907138 is a deficient number, since it is larger than the sum of its proper divisors (1018389322).

1897907138 is a wasteful number, since it uses less digits than its factorization.

1897907138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23145252.

The product of its (nonzero) digits is 762048, while the sum is 53.

The square root of 1897907138 is about 43564.9760472791. The cubic root of 1897907138 is about 1238.1074011442.

The spelling of 1897907138 in words is "one billion, eight hundred ninety-seven million, nine hundred seven thousand, one hundred thirty-eight".