865638150 has 48 divisors (see below), whose sum is σ = 2311924944. Its totient is φ = 213079680.

The previous prime is 865638149. The next prime is 865638187. The reversal of 865638150 is 51836568.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220009 + ... + 223908.

It is an arithmetic number, because the mean of its divisors is an integer number (48165103).

Almost surely, 2^865638150 is an apocalyptic number.

865638150 is an abundant number, since it is smaller than the sum of its proper divisors (1446286794).

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

865638150 is a wasteful number, since it uses less digits than its factorization.

865638150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443945 (or 443940 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 865638150 is about 29421.7292149867. The cubic root of 865638150 is about 953.0421958343.

It can be divided in two parts, 865 and 638150, that added together give a triangular number (639015 = T₁₁₃₀).

The spelling of 865638150 in words is "eight hundred sixty-five million, six hundred thirty-eight thousand, one hundred fifty".