865800156 has 48 divisors (see below), whose sum is σ = 2216670624. Its totient is φ = 261371136.

The previous prime is 865800149. The next prime is 865800163. The reversal of 865800156 is 651008568.

It is an interprime number because it is at equal distance from previous prime (865800149) and next prime (865800163).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44091 + ... + 60626.

It is an arithmetic number, because the mean of its divisors is an integer number (46180638).

Almost surely, 2^865800156 is an apocalyptic number.

It is an amenable number.

865800156 is an abundant number, since it is smaller than the sum of its proper divisors (1350870468).

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

865800156 is a wasteful number, since it uses less digits than its factorization.

865800156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104790 (or 104788 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 865800156 is about 29424.4822554280. The cubic root of 865800156 is about 953.1016467427.

The spelling of 865800156 in words is "eight hundred sixty-five million, eight hundred thousand, one hundred fifty-six".