3638731 has 4 divisors (see below), whose sum is σ = 3852792. Its totient is φ = 3424672.

The previous prime is 3638699. The next prime is 3638753. The reversal of 3638731 is 1378363.

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 3638731 - 2⁵ = 3638699 is a prime.

It is a super-2 number, since 2×3638731² = 26480726580722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3638693 and 3638702.

It is not an unprimeable number, because it can be changed into a prime (3638771) 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, 107005 + ... + 107038.

It is an arithmetic number, because the mean of its divisors is an integer number (963198).

Almost surely, 2^3638731 is an apocalyptic number.

3638731 is a deficient number, since it is larger than the sum of its proper divisors (214061).

3638731 is a wasteful number, since it uses less digits than its factorization.

3638731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214060.

The product of its digits is 9072, while the sum is 31.

The square root of 3638731 is about 1907.5458054789. The cubic root of 3638731 is about 153.8095554417.

The spelling of 3638731 in words is "three million, six hundred thirty-eight thousand, seven hundred thirty-one".