18198799 has 2 divisors, whose sum is σ = 18198800. Its totient is φ = 18198798.

The previous prime is 18198781. The next prime is 18198833. The reversal of 18198799 is 99789181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18198799 - 2⁹ = 18198287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18198779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099399 + 9099400.

It is an arithmetic number, because the mean of its divisors is an integer number (9099400).

Almost surely, 2^18198799 is an apocalyptic number.

18198799 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198799 is an equidigital number, since it uses as much as digits as its factorization.

18198799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 52.

The square root of 18198799 is about 4266.0050398470. The cubic root of 18198799 is about 263.0354253582.

The spelling of 18198799 in words is "eighteen million, one hundred ninety-eight thousand, seven hundred ninety-nine".