18900023 has 4 divisors (see below), whose sum is σ = 18999168. Its totient is φ = 18800880.

The previous prime is 18899999. The next prime is 18900053. The reversal of 18900023 is 32000981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18900023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18900053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49286 + ... + 49667.

It is an arithmetic number, because the mean of its divisors is an integer number (4749792).

Almost surely, 2^18900023 is an apocalyptic number.

18900023 is a deficient number, since it is larger than the sum of its proper divisors (99145).

18900023 is an equidigital number, since it uses as much as digits as its factorization.

18900023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99144.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 18900023 is about 4347.4156691073. The cubic root of 18900023 is about 266.3713085745.

The spelling of 18900023 in words is "eighteen million, nine hundred thousand, twenty-three".