18319850 has 12 divisors (see below), whose sum is σ = 34075014. Its totient is φ = 7327920.

The previous prime is 18319837. The next prime is 18319901. The reversal of 18319850 is 5891381.

It can be written as a sum of positive squares in 3 ways, for example, as 9504889 + 8814961 = 3083^2 + 2969^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18319850.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 183149 + ... + 183248.

Almost surely, 2^18319850 is an apocalyptic number.

18319850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18319850 is a deficient number, since it is larger than the sum of its proper divisors (15755164).

18319850 is a wasteful number, since it uses less digits than its factorization.

18319850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366409 (or 366404 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18319850 is about 4280.1693891714. The cubic root of 18319850 is about 263.6173385543.

The spelling of 18319850 in words is "eighteen million, three hundred nineteen thousand, eight hundred fifty".