39902621 has 8 divisors (see below), whose sum is σ = 46090944. Its totient is φ = 34141120.

The previous prime is 39902617. The next prime is 39902669. The reversal of 39902621 is 12620993.

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 39902621 - 2² = 39902617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39962621) 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, 106505 + ... + 106878.

It is an arithmetic number, because the mean of its divisors is an integer number (5761368).

Almost surely, 2^39902621 is an apocalyptic number.

It is an amenable number.

39902621 is a deficient number, since it is larger than the sum of its proper divisors (6188323).

39902621 is a wasteful number, since it uses less digits than its factorization.

39902621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213411.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 39902621 is about 6316.8521432752. The cubic root of 39902621 is about 341.7174375738.

The spelling of 39902621 in words is "thirty-nine million, nine hundred two thousand, six hundred twenty-one".