865830625 has 45 divisors (see below), whose sum is σ = 1200460261. Its totient is φ = 623810000.

The previous prime is 865830577. The next prime is 865830629. The reversal of 865830625 is 526038568.

It is a happy number.

The square root of 865830625 is 29425.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 67881121 + 797949504 = 8239^2 + 28248^2 .

It is not a de Polignac number, because 865830625 - 2²¹ = 863733473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865830629) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8091822 + ... + 8091928.

Almost surely, 2^865830625 is an apocalyptic number.

865830625 is the 29425-th square number.

865830625 is the 14713-rd centered octagonal number.

It is an amenable number.

865830625 is a deficient number, since it is larger than the sum of its proper divisors (334629636).

865830625 is an equidigital number, since it uses as much as digits as its factorization.

865830625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The cubic root of 865830625 is about 953.1128270415.

The spelling of 865830625 in words is "eight hundred sixty-five million, eight hundred thirty thousand, six hundred twenty-five".