22172904 has 48 divisors (see below), whose sum is σ = 64673700. Its totient is φ = 6822144.

The previous prime is 22172903. The next prime is 22172911. The reversal of 22172904 is 40927122.

It can be written as a sum of positive squares in 2 ways, for example, as 16892100 + 5280804 = 4110^2 + 2298^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22172903) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 10909 + ... + 12780.

Almost surely, 2^22172904 is an apocalyptic number.

22172904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22172904 is an abundant number, since it is smaller than the sum of its proper divisors (42500796).

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

22172904 is a wasteful number, since it uses less digits than its factorization.

22172904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23714 (or 23707 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 22172904 is about 4708.8113149711. The cubic root of 22172904 is about 280.9360847189.

The spelling of 22172904 in words is "twenty-two million, one hundred seventy-two thousand, nine hundred four".