3640621 has 4 divisors (see below), whose sum is σ = 3668544. Its totient is φ = 3612700.

The previous prime is 3640597. The next prime is 3640633. The reversal of 3640621 is 1260463.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3640621 - 2⁵ = 3640589 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3640592 and 3640601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640661) 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, 13765 + ... + 14026.

It is an arithmetic number, because the mean of its divisors is an integer number (917136).

Almost surely, 2^3640621 is an apocalyptic number.

It is an amenable number.

3640621 is a deficient number, since it is larger than the sum of its proper divisors (27923).

3640621 is a wasteful number, since it uses less digits than its factorization.

3640621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27922.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 3640621 is about 1908.0411421141. The cubic root of 3640621 is about 153.8361810010.

The spelling of 3640621 in words is "three million, six hundred forty thousand, six hundred twenty-one".