3656731 has 8 divisors (see below), whose sum is σ = 3986640. Its totient is φ = 3333792.

The previous prime is 3656707. The next prime is 3656753. The reversal of 3656731 is 1376563.

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

It is a cyclic number.

It is not a de Polignac number, because 3656731 - 2⁵ = 3656699 is a prime.

It is a super-2 number, since 2×3656731² = 26743363212722, which contains 22 as substring.

It is a Duffinian number.

3656731 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3656693 and 3656702.

It is not an unprimeable number, because it can be changed into a prime (3656231) 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 7 ways as a sum of consecutive naturals, for example, 616 + ... + 2773.

It is an arithmetic number, because the mean of its divisors is an integer number (498330).

Almost surely, 2^3656731 is an apocalyptic number.

3656731 is a deficient number, since it is larger than the sum of its proper divisors (329909).

3656731 is a wasteful number, since it uses less digits than its factorization.

3656731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485.

The product of its digits is 11340, while the sum is 31.

The square root of 3656731 is about 1912.2580892756. The cubic root of 3656731 is about 154.0627590386.

The spelling of 3656731 in words is "three million, six hundred fifty-six thousand, seven hundred thirty-one".