865429872 has 40 divisors (see below), whose sum is σ = 2236880640. Its totient is φ = 288323520.

The previous prime is 865429871. The next prime is 865429891. The reversal of 865429872 is 278924568.

865429872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865429871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120297 + ... + 127287.

It is an arithmetic number, because the mean of its divisors is an integer number (55922016).

Almost surely, 2^865429872 is an apocalyptic number.

It is an amenable number.

865429872 is an abundant number, since it is smaller than the sum of its proper divisors (1371450768).

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

865429872 is a wasteful number, since it uses less digits than its factorization.

865429872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9581 (or 9575 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 865429872 is about 29418.1894752209. The cubic root of 865429872 is about 952.9657537149.

The spelling of 865429872 in words is "eight hundred sixty-five million, four hundred twenty-nine thousand, eight hundred seventy-two".