22400172 has 24 divisors (see below), whose sum is σ = 58074800. Its totient is φ = 7466688.

The previous prime is 22400167. The next prime is 22400173. The reversal of 22400172 is 27100422.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22400173) 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, 103597 + ... + 103812.

Almost surely, 2^22400172 is an apocalyptic number.

It is an amenable number.

22400172 is an abundant number, since it is smaller than the sum of its proper divisors (35674628).

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

22400172 is a wasteful number, since it uses less digits than its factorization.

22400172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207422 (or 207414 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22400172 is about 4732.8819972613. The cubic root of 22400172 is about 281.8926707899.

Adding to 22400172 its reverse (27100422), we get a palindrome (49500594).

The spelling of 22400172 in words is "twenty-two million, four hundred thousand, one hundred seventy-two".