18425999 has 2 divisors, whose sum is σ = 18426000. Its totient is φ = 18425998.

The previous prime is 18425983. The next prime is 18426017. The reversal of 18425999 is 99952481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18425999 - 2⁴ = 18425983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18425929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9212999 + 9213000.

It is an arithmetic number, because the mean of its divisors is an integer number (9213000).

Almost surely, 2^18425999 is an apocalyptic number.

18425999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18425999 is an equidigital number, since it uses as much as digits as its factorization.

18425999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 47.

The square root of 18425999 is about 4292.5515722004. The cubic root of 18425999 is about 264.1255094599.

The spelling of 18425999 in words is "eighteen million, four hundred twenty-five thousand, nine hundred ninety-nine".