18319499 has 8 divisors (see below), whose sum is σ = 20016192. Its totient is φ = 16628040.

The previous prime is 18319463. The next prime is 18319507. The reversal of 18319499 is 99491381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18319499 - 2⁸ = 18319243 is a prime.

It is a super-2 number, since 2×18319499² = 671208087222002, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18319409) 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 in 7 ways as a sum of consecutive naturals, for example, 11612 + ... + 13094.

It is an arithmetic number, because the mean of its divisors is an integer number (2502024).

Almost surely, 2^18319499 is an apocalyptic number.

18319499 is a deficient number, since it is larger than the sum of its proper divisors (1696693).

18319499 is a wasteful number, since it uses less digits than its factorization.

18319499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617.

The product of its digits is 69984, while the sum is 44.

The square root of 18319499 is about 4280.1283859249. The cubic root of 18319499 is about 263.6156549474.

The spelling of 18319499 in words is "eighteen million, three hundred nineteen thousand, four hundred ninety-nine".