3639999 has 16 divisors (see below), whose sum is σ = 5370624. Its totient is φ = 2174400.

The previous prime is 3639997. The next prime is 3640019. The reversal of 3639999 is 9999363.

It is not a de Polignac number, because 3639999 - 2¹ = 3639997 is a prime.

3639999 is a modest number, since divided by 9999 gives 363 as remainder.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1654 + ... + 3164.

It is an arithmetic number, because the mean of its divisors is an integer number (335664).

Almost surely, 2^3639999 is an apocalyptic number.

3639999 is a deficient number, since it is larger than the sum of its proper divisors (1730625).

3639999 is a wasteful number, since it uses less digits than its factorization.

3639999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598.

The product of its digits is 354294, while the sum is 48.

The square root of 3639999 is about 1907.8781407627. The cubic root of 3639999 is about 153.8274195329.

The spelling of 3639999 in words is "three million, six hundred thirty-nine thousand, nine hundred ninety-nine".