22297990 has 64 divisors (see below), whose sum is σ = 48771072. Its totient is φ = 7228800.

The previous prime is 22297981. The next prime is 22297997. The reversal of 22297990 is 9979222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22297997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44079 + ... + 44581.

It is an arithmetic number, because the mean of its divisors is an integer number (762048).

Almost surely, 2^22297990 is an apocalyptic number.

22297990 is an abundant number, since it is smaller than the sum of its proper divisors (26473082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22297990 is a wasteful number, since it uses less digits than its factorization.

22297990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 22297990 is about 4722.0747558674. The cubic root of 22297990 is about 281.4633844017.

The spelling of 22297990 in words is "twenty-two million, two hundred ninety-seven thousand, nine hundred ninety".