23890491 has 64 divisors (see below), whose sum is σ = 40919040. Its totient is φ = 13685760.

The previous prime is 23890483. The next prime is 23890501. The reversal of 23890491 is 19409832.

It is not a de Polignac number, because 23890491 - 2³ = 23890483 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (23890411) 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 63 ways as a sum of consecutive naturals, for example, 327231 + ... + 327303.

It is an arithmetic number, because the mean of its divisors is an integer number (639360).

Almost surely, 2^23890491 is an apocalyptic number.

23890491 is a deficient number, since it is larger than the sum of its proper divisors (17028549).

23890491 is a wasteful number, since it uses less digits than its factorization.

23890491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 23890491 is about 4887.7899913969. The cubic root of 23890491 is about 288.0105247890.

The spelling of 23890491 in words is "twenty-three million, eight hundred ninety thousand, four hundred ninety-one".