3639808 has 20 divisors (see below), whose sum is σ = 7273530. Its totient is φ = 1819648.

The previous prime is 3639781. The next prime is 3639817. The reversal of 3639808 is 8089363.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3504384 + 135424 = 1872^2 + 368^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3043 + ... + 4066.

Almost surely, 2^3639808 is an apocalyptic number.

It is an amenable number.

3639808 is a deficient number, since it is larger than the sum of its proper divisors (3633722).

3639808 is an frugal number, since it uses more digits than its factorization.

3639808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7127 (or 7111 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 3639808 is about 1907.8280844982. The cubic root of 3639808 is about 153.8247289139.

The spelling of 3639808 in words is "three million, six hundred thirty-nine thousand, eight hundred eight".