3638889 has 6 divisors (see below), whose sum is σ = 5256186. Its totient is φ = 2425920.

The previous prime is 3638879. The next prime is 3638903. The reversal of 3638889 is 9888363.

3638889 is a `hidden beast` number, since 3 + 638 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 1734489 = 1380^2 + 1317^2 .

It is not a de Polignac number, because 3638889 - 2¹⁷ = 3507817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3638809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202152 + ... + 202169.

It is an arithmetic number, because the mean of its divisors is an integer number (876031).

Almost surely, 2^3638889 is an apocalyptic number.

It is an amenable number.

3638889 is a deficient number, since it is larger than the sum of its proper divisors (1617297).

3638889 is a wasteful number, since it uses less digits than its factorization.

3638889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404327 (or 404324 counting only the distinct ones).

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

The square root of 3638889 is about 1907.5872195001. The cubic root of 3638889 is about 153.8117816353.

The spelling of 3638889 in words is "three million, six hundred thirty-eight thousand, eight hundred eighty-nine".