3665631 has 8 divisors (see below), whose sum is σ = 4897024. Its totient is φ = 2439000.

The previous prime is 3665609. The next prime is 3665633. The reversal of 3665631 is 1365663.

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

It is not a de Polignac number, because 3665631 - 2¹³ = 3657439 is a prime.

It is a super-2 number, since 2×3665631² = 26873701256322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (612128).

Almost surely, 2^3665631 is an apocalyptic number.

3665631 is a deficient number, since it is larger than the sum of its proper divisors (1231393).

3665631 is a wasteful number, since it uses less digits than its factorization.

3665631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381.

The product of its digits is 9720, while the sum is 30.

The square root of 3665631 is about 1914.5837667754. The cubic root of 3665631 is about 154.1876472380.

Subtracting from 3665631 its reverse (1365663), we obtain a cube (2299968 = 132³).

The spelling of 3665631 in words is "three million, six hundred sixty-five thousand, six hundred thirty-one".