18394499 has 2 divisors, whose sum is σ = 18394500. Its totient is φ = 18394498.

The previous prime is 18394469. The next prime is 18394507. The reversal of 18394499 is 99449381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18394499 - 2¹² = 18390403 is a prime.

It is a super-2 number, since 2×18394499² = 676715186922002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18394429) 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, 9197249 + 9197250.

It is an arithmetic number, because the mean of its divisors is an integer number (9197250).

Almost surely, 2^18394499 is an apocalyptic number.

18394499 is a deficient number, since it is larger than the sum of its proper divisors (1).

18394499 is an equidigital number, since it uses as much as digits as its factorization.

18394499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 18394499 is about 4288.8808563540. The cubic root of 18394499 is about 263.9749124844.

The spelling of 18394499 in words is "eighteen million, three hundred ninety-four thousand, four hundred ninety-nine".