22791639 has 16 divisors (see below), whose sum is σ = 33191424. Its totient is φ = 13826400.

The previous prime is 22791631. The next prime is 22791649. The reversal of 22791639 is 93619722.

It is not a de Polignac number, because 22791639 - 2³ = 22791631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 22791597 and 22791606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22791631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1347 + ... + 6884.

It is an arithmetic number, because the mean of its divisors is an integer number (2074464).

Almost surely, 2^22791639 is an apocalyptic number.

22791639 is a deficient number, since it is larger than the sum of its proper divisors (10399785).

22791639 is a wasteful number, since it uses less digits than its factorization.

22791639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8318.

The product of its digits is 40824, while the sum is 39.

The square root of 22791639 is about 4774.0589648642. The cubic root of 22791639 is about 283.5253220883.

The spelling of 22791639 in words is "twenty-two million, seven hundred ninety-one thousand, six hundred thirty-nine".