23172945 has 8 divisors (see below), whose sum is σ = 37076736. Its totient is φ = 12358896.

The previous prime is 23172923. The next prime is 23172949. The reversal of 23172945 is 54927132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23172945 - 2⁶ = 23172881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23172949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772417 + ... + 772446.

It is an arithmetic number, because the mean of its divisors is an integer number (4634592).

Almost surely, 2^23172945 is an apocalyptic number.

It is an amenable number.

23172945 is a deficient number, since it is larger than the sum of its proper divisors (13903791).

23172945 is a wasteful number, since it uses less digits than its factorization.

23172945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544871.

The product of its digits is 15120, while the sum is 33.

The square root of 23172945 is about 4813.8285179262. The cubic root of 23172945 is about 285.0977196453.

The spelling of 23172945 in words is "twenty-three million, one hundred seventy-two thousand, nine hundred forty-five".