18319959 has 16 divisors (see below), whose sum is σ = 31018240. Its totient is φ = 10468440.

The previous prime is 18319919. The next prime is 18319963. The reversal of 18319959 is 95991381.

It is not a de Polignac number, because 18319959 - 2¹³ = 18311767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18319919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48277 + ... + 48654.

It is an arithmetic number, because the mean of its divisors is an integer number (1938640).

Almost surely, 2^18319959 is an apocalyptic number.

18319959 is a deficient number, since it is larger than the sum of its proper divisors (12698281).

18319959 is an equidigital number, since it uses as much as digits as its factorization.

18319959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96947 (or 96941 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 18319959 is about 4280.1821222934. The cubic root of 18319959 is about 263.6178613794.

The spelling of 18319959 in words is "eighteen million, three hundred nineteen thousand, nine hundred fifty-nine".