865215738 has 48 divisors (see below), whose sum is σ = 1905111936. Its totient is φ = 283746240.

The previous prime is 865215737. The next prime is 865215763. The reversal of 865215738 is 837512568.

865215738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 865215693 and 865215702.

It is not an unprimeable number, because it can be changed into a prime (865215737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403806 + ... + 405942.

It is an arithmetic number, because the mean of its divisors is an integer number (39689832).

Almost surely, 2^865215738 is an apocalyptic number.

865215738 is an abundant number, since it is smaller than the sum of its proper divisors (1039896198).

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

865215738 is a wasteful number, since it uses less digits than its factorization.

865215738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499 (or 2496 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 865215738 is about 29414.5497670796. The cubic root of 865215738 is about 952.8871495406.

The spelling of 865215738 in words is "eight hundred sixty-five million, two hundred fifteen thousand, seven hundred thirty-eight".