3638986 has 16 divisors (see below), whose sum is σ = 6224904. Its totient is φ = 1580544.

The previous prime is 3638959. The next prime is 3638993. The reversal of 3638986 is 6898363.

It can be written as a sum of positive squares in 4 ways, for example, as 2461761 + 1177225 = 1569^2 + 1085^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3675 + ... + 4558.

Almost surely, 2^3638986 is an apocalyptic number.

3638986 is a deficient number, since it is larger than the sum of its proper divisors (2585918).

3638986 is a wasteful number, since it uses less digits than its factorization.

3638986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265.

The product of its digits is 186624, while the sum is 43.

The square root of 3638986 is about 1907.6126441183. The cubic root of 3638986 is about 153.8131483171.

It can be divided in two parts, 3638 and 986, that added together give a square (4624 = 68²).

The spelling of 3638986 in words is "three million, six hundred thirty-eight thousand, nine hundred eighty-six".