3640637 has 16 divisors (see below), whose sum is σ = 4889472. Its totient is φ = 2617920.

The previous prime is 3640633. The next prime is 3640643. The reversal of 3640637 is 7360463.

It is a cyclic number.

It is not a de Polignac number, because 3640637 - 2² = 3640633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818 + ... + 2819.

It is an arithmetic number, because the mean of its divisors is an integer number (305592).

Almost surely, 2^3640637 is an apocalyptic number.

It is an amenable number.

3640637 is a deficient number, since it is larger than the sum of its proper divisors (1248835).

3640637 is a wasteful number, since it uses less digits than its factorization.

3640637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 3640637 is about 1908.0453348912. The cubic root of 3640637 is about 153.8364063632.

The spelling of 3640637 in words is "three million, six hundred forty thousand, six hundred thirty-seven".