23172765 has 32 divisors (see below), whose sum is σ = 46227456. Its totient is φ = 9629760.

The previous prime is 23172763. The next prime is 23172811. The reversal of 23172765 is 56727132.

It is not a de Polignac number, because 23172765 - 2¹ = 23172763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23172763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8877 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (1444608).

Almost surely, 2^23172765 is an apocalyptic number.

It is an amenable number.

23172765 is a deficient number, since it is larger than the sum of its proper divisors (23054691).

23172765 is a wasteful number, since it uses less digits than its factorization.

23172765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20089.

The product of its digits is 17640, while the sum is 33.

The square root of 23172765 is about 4813.8098217524. The cubic root of 23172765 is about 285.0969814608.

Adding to 23172765 its reverse (56727132), we get a palindrome (79899897).

The spelling of 23172765 in words is "twenty-three million, one hundred seventy-two thousand, seven hundred sixty-five".