39924921 has 8 divisors (see below), whose sum is σ = 53512704. Its totient is φ = 26476880.

The previous prime is 39924917. The next prime is 39924923. The reversal of 39924921 is 12942993.

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 39924921 - 2² = 39924917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39924921.

It is not an unprimeable number, because it can be changed into a prime (39924923) 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, 34266 + ... + 35411.

It is an arithmetic number, because the mean of its divisors is an integer number (6689088).

Almost surely, 2^39924921 is an apocalyptic number.

It is an amenable number.

39924921 is a deficient number, since it is larger than the sum of its proper divisors (13587783).

39924921 is a wasteful number, since it uses less digits than its factorization.

39924921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69871.

The product of its digits is 34992, while the sum is 39.

The square root of 39924921 is about 6318.6170164048. The cubic root of 39924921 is about 341.7810831819.

The spelling of 39924921 in words is "thirty-nine million, nine hundred twenty-four thousand, nine hundred twenty-one".