3638988 has 36 divisors (see below), whose sum is σ = 9257248. Its totient is φ = 1205280.

The previous prime is 3638959. The next prime is 3638993. The reversal of 3638988 is 8898363.

3638988 is a `hidden beast` number, since 3 + 638 + 9 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9570 + ... + 9942.

Almost surely, 2^3638988 is an apocalyptic number.

It is an amenable number.

3638988 is an abundant number, since it is smaller than the sum of its proper divisors (5618260).

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

3638988 is a wasteful number, since it uses less digits than its factorization.

3638988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 649 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 3638988 is about 1907.6131683337. The cubic root of 3638988 is about 153.8131764958.

The spelling of 3638988 in words is "three million, six hundred thirty-eight thousand, nine hundred eighty-eight".