23165990 has 16 divisors (see below), whose sum is σ = 43044480. Its totient is φ = 8967360.

The previous prime is 23165981. The next prime is 23165993. The reversal of 23165990 is 9956132.

23165990 = 307² + 308² + ... + 461².

It is a self number, because there is not a number n which added to its sum of digits gives 23165990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23165993) 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, 37055 + ... + 37674.

It is an arithmetic number, because the mean of its divisors is an integer number (2690280).

Almost surely, 2^23165990 is an apocalyptic number.

23165990 is a deficient number, since it is larger than the sum of its proper divisors (19878490).

23165990 is a wasteful number, since it uses less digits than its factorization.

23165990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74767.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 23165990 is about 4813.1060657334. The cubic root of 23165990 is about 285.0691942385.

The spelling of 23165990 in words is "twenty-three million, one hundred sixty-five thousand, nine hundred ninety".