3638431 has 4 divisors (see below), whose sum is σ = 3663000. Its totient is φ = 3613864.

The previous prime is 3638419. The next prime is 3638473. The reversal of 3638431 is 1348363.

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

It is a cyclic number.

It is not a de Polignac number, because 3638431 - 2⁷ = 3638303 is a prime.

It is a super-2 number, since 2×3638431² = 26476360283522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3638431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638491) 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, 12061 + ... + 12358.

It is an arithmetic number, because the mean of its divisors is an integer number (915750).

Almost surely, 2^3638431 is an apocalyptic number.

3638431 is a deficient number, since it is larger than the sum of its proper divisors (24569).

3638431 is a wasteful number, since it uses less digits than its factorization.

3638431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24568.

The product of its digits is 5184, while the sum is 28.

The square root of 3638431 is about 1907.4671687869. The cubic root of 3638431 is about 153.8053283147.

The spelling of 3638431 in words is "three million, six hundred thirty-eight thousand, four hundred thirty-one".