23431666 has 4 divisors (see below), whose sum is σ = 35147502. Its totient is φ = 11715832.

The previous prime is 23431663. The next prime is 23431669. The reversal of 23431666 is 66613432.

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

It is an interprime number because it is at equal distance from previous prime (23431663) and next prime (23431669).

It can be written as a sum of positive squares in only one way, i.e., 14220441 + 9211225 = 3771^2 + 3035^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (23431663) 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 as a sum of consecutive naturals, namely, 5857915 + ... + 5857918.

Almost surely, 2^23431666 is an apocalyptic number.

23431666 is a deficient number, since it is larger than the sum of its proper divisors (11715836).

23431666 is a wasteful number, since it uses less digits than its factorization.

23431666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11715835.

The product of its digits is 15552, while the sum is 31.

The square root of 23431666 is about 4840.6266123303. The cubic root of 23431666 is about 286.1548137332.

The spelling of 23431666 in words is "twenty-three million, four hundred thirty-one thousand, six hundred sixty-six".