3900621 has 8 divisors (see below), whose sum is σ = 5211360. Its totient is φ = 2595152.

The previous prime is 3900583. The next prime is 3900623. The reversal of 3900621 is 1260093.

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 3900621 - 2¹⁸ = 3638477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900623) 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, 991 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (651420).

Almost surely, 2^3900621 is an apocalyptic number.

It is an amenable number.

3900621 is a deficient number, since it is larger than the sum of its proper divisors (1310739).

3900621 is a wasteful number, since it uses less digits than its factorization.

3900621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 3900621 is about 1974.9989873415. The cubic root of 3900621 is about 157.4144458508.

The spelling of 3900621 in words is "three million, nine hundred thousand, six hundred twenty-one".