3688731 has 12 divisors (see below), whose sum is σ = 5416320. Its totient is φ = 2418480.

The previous prime is 3688709. The next prime is 3688757. The reversal of 3688731 is 1378863.

It is not a de Polignac number, because 3688731 - 2⁶ = 3688667 is a prime.

It is a super-2 number, since 2×3688731² = 27213472780722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3688781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2811 + ... + 3908.

It is an arithmetic number, because the mean of its divisors is an integer number (451360).

Almost surely, 2^3688731 is an apocalyptic number.

3688731 is a deficient number, since it is larger than the sum of its proper divisors (1727589).

3688731 is a wasteful number, since it uses less digits than its factorization.

3688731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786 (or 6783 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 3688731 is about 1920.6069353202. The cubic root of 3688731 is about 154.5108548002.

The spelling of 3688731 in words is "three million, six hundred eighty-eight thousand, seven hundred thirty-one".