23405998 has 48 divisors (see below), whose sum is σ = 45313632. Its totient is φ = 8870400.

The previous prime is 23405983. The next prime is 23406007. The reversal of 23405998 is 89950432.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 23405998.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 69286 + ... + 69622.

It is an arithmetic number, because the mean of its divisors is an integer number (944034).

Almost surely, 2^23405998 is an apocalyptic number.

23405998 is a deficient number, since it is larger than the sum of its proper divisors (21907634).

23405998 is a wasteful number, since it uses less digits than its factorization.

23405998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 23405998 is about 4837.9745762044. The cubic root of 23405998 is about 286.0502870156.

It can be divided in two parts, 2340 and 5998, that added together give a palindrome (8338).

The spelling of 23405998 in words is "twenty-three million, four hundred five thousand, nine hundred ninety-eight".