3638631 has 4 divisors (see below), whose sum is σ = 4851512. Its totient is φ = 2425752.

The previous prime is 3638573. The next prime is 3638639. The reversal of 3638631 is 1368363.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3638631 - 2¹⁸ = 3376487 is a prime.

It is a super-2 number, since 2×3638631² = 26479271108322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606436 + ... + 606441.

It is an arithmetic number, because the mean of its divisors is an integer number (1212878).

Almost surely, 2^3638631 is an apocalyptic number.

3638631 is a deficient number, since it is larger than the sum of its proper divisors (1212881).

3638631 is a wasteful number, since it uses less digits than its factorization.

3638631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212880.

The product of its digits is 7776, while the sum is 30.

The square root of 3638631 is about 1907.5195936084. The cubic root of 3638631 is about 153.8081464252.

The spelling of 3638631 in words is "three million, six hundred thirty-eight thousand, six hundred thirty-one".