3638999 has 8 divisors (see below), whose sum is σ = 4478880. Its totient is φ = 2879136.

The previous prime is 3638993. The next prime is 3639017. The reversal of 3638999 is 9998363.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-3638999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19904 + ... + 20085.

It is an arithmetic number, because the mean of its divisors is an integer number (559860).

Almost surely, 2^3638999 is an apocalyptic number.

3638999 is a deficient number, since it is larger than the sum of its proper divisors (839881).

3638999 is a wasteful number, since it uses less digits than its factorization.

3638999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40009.

The product of its digits is 314928, while the sum is 47.

The square root of 3638999 is about 1907.6160515156. The cubic root of 3638999 is about 153.8133314788.

The spelling of 3638999 in words is "three million, six hundred thirty-eight thousand, nine hundred ninety-nine".