22921856 has 32 divisors (see below), whose sum is σ = 46046880. Its totient is φ = 11365120.

The previous prime is 22921837. The next prime is 22921859. The reversal of 22921856 is 65812922.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×22921856² = 1050822964969472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22921859) 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, 16085 + ... + 17451.

It is an arithmetic number, because the mean of its divisors is an integer number (1438965).

Almost surely, 2^22921856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22921856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23023440).

22921856 is an abundant number, since it is smaller than the sum of its proper divisors (23125024).

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

22921856 is a wasteful number, since it uses less digits than its factorization.

22921856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512 (or 1500 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 22921856 is about 4787.6775162912. The cubic root of 22921856 is about 284.0642584214.

The spelling of 22921856 in words is "twenty-two million, nine hundred twenty-one thousand, eight hundred fifty-six".