18913799 has 2 divisors, whose sum is σ = 18913800. Its totient is φ = 18913798.

The previous prime is 18913781. The next prime is 18913819. The reversal of 18913799 is 99731981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18913799 - 2²⁰ = 17865223 is a prime.

It is a super-2 number, since 2×18913799² = 715463585224802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18913709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456899 + 9456900.

It is an arithmetic number, because the mean of its divisors is an integer number (9456900).

Almost surely, 2^18913799 is an apocalyptic number.

18913799 is a deficient number, since it is larger than the sum of its proper divisors (1).

18913799 is an equidigital number, since it uses as much as digits as its factorization.

18913799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 18913799 is about 4348.9997700621. Note that the first 3 decimals coincide. The cubic root of 18913799 is about 266.4360111404.

The spelling of 18913799 in words is "eighteen million, nine hundred thirteen thousand, seven hundred ninety-nine".