22185172 has 6 divisors (see below), whose sum is σ = 38824058. Its totient is φ = 11092584.

The previous prime is 22185169. The next prime is 22185193. The reversal of 22185172 is 27158122.

It can be written as a sum of positive squares in only one way, i.e., 21958596 + 226576 = 4686^2 + 476^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22185172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2773143 + ... + 2773150.

Almost surely, 2^22185172 is an apocalyptic number.

It is an amenable number.

22185172 is a deficient number, since it is larger than the sum of its proper divisors (16638886).

22185172 is a wasteful number, since it uses less digits than its factorization.

22185172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546297 (or 5546295 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 22185172 is about 4710.1137990499. The cubic root of 22185172 is about 280.9878880136.

The spelling of 22185172 in words is "twenty-two million, one hundred eighty-five thousand, one hundred seventy-two".