253868157 has 12 divisors (see below), whose sum is σ = 388269180. Its totient is φ = 159289728.

The previous prime is 253868149. The next prime is 253868171. The reversal of 253868157 is 751868352.

253868157 is a `hidden beast` number, since 2 + 538 + 68 + 1 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 127103076 + 126765081 = 11274^2 + 11259^2 .

It is not a de Polignac number, because 253868157 - 2³ = 253868149 is a prime.

It is a super-2 number, since 2×253868157² = 128898082277153298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253868107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 829482 + ... + 829787.

It is an arithmetic number, because the mean of its divisors is an integer number (32355765).

Almost surely, 2^253868157 is an apocalyptic number.

It is an amenable number.

253868157 is a deficient number, since it is larger than the sum of its proper divisors (134401023).

253868157 is a wasteful number, since it uses less digits than its factorization.

253868157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659292 (or 1659289 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 253868157 is about 15933.2406308321. The cubic root of 253868157 is about 633.1929587013.

The spelling of 253868157 in words is "two hundred fifty-three million, eight hundred sixty-eight thousand, one hundred fifty-seven".