22399872 has 64 divisors (see below), whose sum is σ = 64920960. Its totient is φ = 6786560.

The previous prime is 22399849. The next prime is 22399889. The reversal of 22399872 is 27899322.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1573 + ... + 6875.

It is an arithmetic number, because the mean of its divisors is an integer number (1014390).

Almost surely, 2^22399872 is an apocalyptic number.

22399872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22399872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32460480).

22399872 is an abundant number, since it is smaller than the sum of its proper divisors (42521088).

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

22399872 is a wasteful number, since it uses less digits than its factorization.

22399872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331 (or 5319 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 22399872 is about 4732.8503039923. The cubic root of 22399872 is about 281.8914123445.

The spelling of 22399872 in words is "twenty-two million, three hundred ninety-nine thousand, eight hundred seventy-two".