865379691 has 48 divisors (see below), whose sum is σ = 1416130560. Its totient is φ = 504423360.

The previous prime is 865379677. The next prime is 865379729. The reversal of 865379691 is 196973568.

It is not a de Polignac number, because 865379691 - 2⁷ = 865379563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865374691) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1099200 + ... + 1099986.

It is an arithmetic number, because the mean of its divisors is an integer number (29502720).

Almost surely, 2^865379691 is an apocalyptic number.

865379691 is a deficient number, since it is larger than the sum of its proper divisors (550750869).

865379691 is a wasteful number, since it uses less digits than its factorization.

865379691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216 (or 1213 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 865379691 is about 29417.3365721644. The cubic root of 865379691 is about 952.9473344683.

The spelling of 865379691 in words is "eight hundred sixty-five million, three hundred seventy-nine thousand, six hundred ninety-one".