865905506 has 16 divisors (see below), whose sum is σ = 1447644960. Its totient is φ = 386038080.

The previous prime is 865905503. The next prime is 865905533. The reversal of 865905506 is 605509568.

It is a super-2 number, since 2×865905506² = 1499584690642232072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (865905503) 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, 669560 + ... + 670851.

It is an arithmetic number, because the mean of its divisors is an integer number (90477810).

Almost surely, 2^865905506 is an apocalyptic number.

865905506 is a deficient number, since it is larger than the sum of its proper divisors (581739454).

865905506 is a wasteful number, since it uses less digits than its factorization.

865905506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340449.

The product of its (nonzero) digits is 324000, while the sum is 44.

The square root of 865905506 is about 29426.2723769084. The cubic root of 865905506 is about 953.1403027711.

The spelling of 865905506 in words is "eight hundred sixty-five million, nine hundred five thousand, five hundred six".