22397928 has 32 divisors (see below), whose sum is σ = 63994560. Its totient is φ = 6399360.

The previous prime is 22397927. The next prime is 22397951. The reversal of 22397928 is 82979322.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 22397928.

It is not an unprimeable number, because it can be changed into a prime (22397923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66493 + ... + 66828.

It is an arithmetic number, because the mean of its divisors is an integer number (1999830).

Almost surely, 2^22397928 is an apocalyptic number.

22397928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

22397928 is an abundant number, since it is smaller than the sum of its proper divisors (41596632).

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

22397928 is a wasteful number, since it uses less digits than its factorization.

22397928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133337 (or 133333 counting only the distinct ones).

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

The square root of 22397928 is about 4732.6449264655. The cubic root of 22397928 is about 281.8832573462.

The spelling of 22397928 in words is "twenty-two million, three hundred ninety-seven thousand, nine hundred twenty-eight".