18399950 has 24 divisors (see below), whose sum is σ = 36238752. Its totient is φ = 6926720.

The previous prime is 18399943. The next prime is 18399973. The reversal of 18399950 is 5999381.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9974 + ... + 11673.

It is an arithmetic number, because the mean of its divisors is an integer number (1509948).

Almost surely, 2^18399950 is an apocalyptic number.

18399950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18399950 is a deficient number, since it is larger than the sum of its proper divisors (17838802).

18399950 is a wasteful number, since it uses less digits than its factorization.

18399950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21676 (or 21671 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 18399950 is about 4289.5162897464. The cubic root of 18399950 is about 264.0009852274. Note that the first 3 decimals are identical.

The spelling of 18399950 in words is "eighteen million, three hundred ninety-nine thousand, nine hundred fifty".