39922921 has 4 divisors (see below), whose sum is σ = 39949200. Its totient is φ = 39896644.

The previous prime is 39922913. The next prime is 39922931. The reversal of 39922921 is 12922993.

It is the 2580-th star number.

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 39922921 - 2³ = 39922913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39922931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10711 + ... + 13948.

It is an arithmetic number, because the mean of its divisors is an integer number (9987300).

Almost surely, 2^39922921 is an apocalyptic number.

It is an amenable number.

39922921 is a deficient number, since it is larger than the sum of its proper divisors (26279).

39922921 is a wasteful number, since it uses less digits than its factorization.

39922921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26278.

The product of its digits is 17496, while the sum is 37.

The square root of 39922921 is about 6318.4587519426. The cubic root of 39922921 is about 341.7753760232.

The spelling of 39922921 in words is "thirty-nine million, nine hundred twenty-two thousand, nine hundred twenty-one".