868139157 has 16 divisors (see below), whose sum is σ = 1217736000. Its totient is φ = 549327744.

The previous prime is 868139149. The next prime is 868139171. The reversal of 868139157 is 751931868.

It is not a de Polignac number, because 868139157 - 2³ = 868139149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868139147) 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, 79432 + ... + 89697.

It is an arithmetic number, because the mean of its divisors is an integer number (76108500).

Almost surely, 2^868139157 is an apocalyptic number.

868139157 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

868139157 is a deficient number, since it is larger than the sum of its proper divisors (349596843).

868139157 is a wasteful number, since it uses less digits than its factorization.

868139157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169220.

The product of its digits is 362880, while the sum is 48.

The square root of 868139157 is about 29464.2012788401. The cubic root of 868139157 is about 953.9591584026.

The spelling of 868139157 in words is "eight hundred sixty-eight million, one hundred thirty-nine thousand, one hundred fifty-seven".