18245999 has 2 divisors, whose sum is σ = 18246000. Its totient is φ = 18245998.

The previous prime is 18245993. The next prime is 18246029. The reversal of 18245999 is 99954281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18245999 - 2²⁰ = 17197423 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18245993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122999 + 9123000.

It is an arithmetic number, because the mean of its divisors is an integer number (9123000).

Almost surely, 2^18245999 is an apocalyptic number.

18245999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18245999 is an equidigital number, since it uses as much as digits as its factorization.

18245999 is an evil number, because the sum of its binary digits is even.

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

The square root of 18245999 is about 4271.5335653603. The cubic root of 18245999 is about 263.2626299884.

The spelling of 18245999 in words is "eighteen million, two hundred forty-five thousand, nine hundred ninety-nine".