863649236 has 12 divisors (see below), whose sum is σ = 1528368660. Its totient is φ = 426972480.

The previous prime is 863649223. The next prime is 863649247. The reversal of 863649236 is 632946368.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 210540100 + 653109136 = 14510^2 + 25556^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212635 + ... + 1213346.

It is an arithmetic number, because the mean of its divisors is an integer number (127364055).

Almost surely, 2^863649236 is an apocalyptic number.

It is an amenable number.

863649236 is a deficient number, since it is larger than the sum of its proper divisors (664719424).

863649236 is a wasteful number, since it uses less digits than its factorization.

863649236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426074 (or 2426072 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 47.

The square root of 863649236 is about 29387.9096908916. The cubic root of 863649236 is about 952.3117241186.

The spelling of 863649236 in words is "eight hundred sixty-three million, six hundred forty-nine thousand, two hundred thirty-six".