23172225 has 24 divisors (see below), whose sum is σ = 38449920. Its totient is φ = 12313920.

The previous prime is 23172223. The next prime is 23172239. The reversal of 23172225 is 52227132.

It is a happy number.

It is not a de Polignac number, because 23172225 - 2¹ = 23172223 is a prime.

It is a super-2 number, since 2×23172225² = 1073904022901250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23172195 and 23172204.

It is not an unprimeable number, because it can be changed into a prime (23172223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37872 + ... + 38478.

It is an arithmetic number, because the mean of its divisors is an integer number (1602080).

Almost surely, 2^23172225 is an apocalyptic number.

23172225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23172225 is a deficient number, since it is larger than the sum of its proper divisors (15277695).

23172225 is a wasteful number, since it uses less digits than its factorization.

23172225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1124 counting only the distinct ones).

The product of its digits is 1680, while the sum is 24.

The square root of 23172225 is about 4813.7537327952. The cubic root of 23172225 is about 285.0947668846.

Adding to 23172225 its reverse (52227132), we get a palindrome (75399357).

The spelling of 23172225 in words is "twenty-three million, one hundred seventy-two thousand, two hundred twenty-five".