18499423 has 2 divisors, whose sum is σ = 18499424. Its totient is φ = 18499422.

The previous prime is 18499421. The next prime is 18499433. The reversal of 18499423 is 32499481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18499423 - 2¹ = 18499421 is a prime.

Together with 18499421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18499421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249711 + 9249712.

It is an arithmetic number, because the mean of its divisors is an integer number (9249712).

Almost surely, 2^18499423 is an apocalyptic number.

18499423 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499423 is an equidigital number, since it uses as much as digits as its factorization.

18499423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 18499423 is about 4301.0955581107. The cubic root of 18499423 is about 264.4758739815.

The spelling of 18499423 in words is "eighteen million, four hundred ninety-nine thousand, four hundred twenty-three".