22742172 has 36 divisors (see below), whose sum is σ = 58714656. Its totient is φ = 7418880.

The previous prime is 22742149. The next prime is 22742191. The reversal of 22742172 is 27124722.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 5029 + ... + 8412.

Almost surely, 2^22742172 is an apocalyptic number.

It is an amenable number.

22742172 is an abundant number, since it is smaller than the sum of its proper divisors (35972484).

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

22742172 is a wasteful number, since it uses less digits than its factorization.

22742172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13498 (or 13493 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 22742172 is about 4768.8753391130. The cubic root of 22742172 is about 283.3200522802.

Adding to 22742172 its reverse (27124722), we get a palindrome (49866894).

The spelling of 22742172 in words is "twenty-two million, seven hundred forty-two thousand, one hundred seventy-two".