18308923 has 2 divisors, whose sum is σ = 18308924. Its totient is φ = 18308922.

The previous prime is 18308921. The next prime is 18308929. The reversal of 18308923 is 32980381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18308923 - 2¹ = 18308921 is a prime.

It is a super-2 number, since 2×18308923² = 670433322839858, which contains 22 as substring.

Together with 18308921, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18308921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154461 + 9154462.

It is an arithmetic number, because the mean of its divisors is an integer number (9154462).

Almost surely, 2^18308923 is an apocalyptic number.

18308923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18308923 is an equidigital number, since it uses as much as digits as its factorization.

18308923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18308923 is about 4278.8927306022. The cubic root of 18308923 is about 263.5649160080.

The spelling of 18308923 in words is "eighteen million, three hundred eight thousand, nine hundred twenty-three".