3990428621 has 8 divisors (see below), whose sum is σ = 4201264320. Its totient is φ = 3779674272.

The previous prime is 3990428579. The next prime is 3990428641. The reversal of 3990428621 is 1268240993.

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 3990428621 - 2⁶ = 3990428557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990428641) 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, 98096 + ... + 132678.

It is an arithmetic number, because the mean of its divisors is an integer number (525158040).

Almost surely, 2^3990428621 is an apocalyptic number.

It is an amenable number.

3990428621 is a deficient number, since it is larger than the sum of its proper divisors (210835699).

3990428621 is a wasteful number, since it uses less digits than its factorization.

3990428621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40675.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 3990428621 is about 63169.8394884774. The cubic root of 3990428621 is about 1586.1339059778.

The spelling of 3990428621 in words is "three billion, nine hundred ninety million, four hundred twenty-eight thousand, six hundred twenty-one".