23172866 has 4 divisors (see below), whose sum is σ = 34759302. Its totient is φ = 11586432.

The previous prime is 23172859. The next prime is 23172869. The reversal of 23172866 is 66827132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13432225 + 9740641 = 3665^2 + 3121^2 .

It is not an unprimeable number, because it can be changed into a prime (23172869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5793215 + ... + 5793218.

Almost surely, 2^23172866 is an apocalyptic number.

23172866 is a deficient number, since it is larger than the sum of its proper divisors (11586436).

23172866 is a wasteful number, since it uses less digits than its factorization.

23172866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11586435.

The product of its digits is 24192, while the sum is 35.

The square root of 23172866 is about 4813.8203123922. The cubic root of 23172866 is about 285.0973956648.

Adding to 23172866 its reverse (66827132), we get a palindrome (89999998).

The spelling of 23172866 in words is "twenty-three million, one hundred seventy-two thousand, eight hundred sixty-six".