18538023 has 24 divisors (see below), whose sum is σ = 30008448. Its totient is φ = 10130736.

The previous prime is 18538001. The next prime is 18538099. The reversal of 18538023 is 32083581.

It is a happy number.

It is not a de Polignac number, because 18538023 - 2⁵ = 18537991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640 + ... + 6122.

It is an arithmetic number, because the mean of its divisors is an integer number (1250352).

Almost surely, 2^18538023 is an apocalyptic number.

18538023 is a deficient number, since it is larger than the sum of its proper divisors (11470425).

18538023 is a wasteful number, since it uses less digits than its factorization.

18538023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523 (or 5516 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 18538023 is about 4305.5804486736. The cubic root of 18538023 is about 264.6596937071.

The spelling of 18538023 in words is "eighteen million, five hundred thirty-eight thousand, twenty-three".