318381999 has 8 divisors (see below), whose sum is σ = 457163952. Its totient is φ = 195927360.

The previous prime is 318381989. The next prime is 318382013. The reversal of 318381999 is 999183813.

It is a happy number.

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

It is not a de Polignac number, because 318381999 - 2⁸ = 318381743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318381919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4081782 + ... + 4081859.

It is an arithmetic number, because the mean of its divisors is an integer number (57145494).

Almost surely, 2^318381999 is an apocalyptic number.

318381999 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

318381999 is a deficient number, since it is larger than the sum of its proper divisors (138781953).

318381999 is a wasteful number, since it uses less digits than its factorization.

318381999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8163657.

The product of its digits is 419904, while the sum is 51.

The square root of 318381999 is about 17843.2620055863. The cubic root of 318381999 is about 682.8356207323.

The spelling of 318381999 in words is "three hundred eighteen million, three hundred eighty-one thousand, nine hundred ninety-nine".