18870023 has 2 divisors, whose sum is σ = 18870024. Its totient is φ = 18870022.

The previous prime is 18870013. The next prime is 18870043. The reversal of 18870023 is 32007881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18870023 - 2¹⁰ = 18868999 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18870013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9435011 + 9435012.

It is an arithmetic number, because the mean of its divisors is an integer number (9435012).

Almost surely, 2^18870023 is an apocalyptic number.

18870023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18870023 is an equidigital number, since it uses as much as digits as its factorization.

18870023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18870023 is about 4343.9639731471. The cubic root of 18870023 is about 266.2302969102.

The spelling of 18870023 in words is "eighteen million, eight hundred seventy thousand, twenty-three".