18400083 has 16 divisors (see below), whose sum is σ = 26503680. Its totient is φ = 11287584.

The previous prime is 18400073. The next prime is 18400091. The reversal of 18400083 is 38000481.

It is not a de Polignac number, because 18400083 - 2⁵ = 18400051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18400003) 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 15 ways as a sum of consecutive naturals, for example, 17548 + ... + 18566.

It is an arithmetic number, because the mean of its divisors is an integer number (1656480).

Almost surely, 2^18400083 is an apocalyptic number.

18400083 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18400083 is a deficient number, since it is larger than the sum of its proper divisors (8103597).

18400083 is a wasteful number, since it uses less digits than its factorization.

18400083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18400083 is about 4289.5317926319. The cubic root of 18400083 is about 264.0016213169.

The spelling of 18400083 in words is "eighteen million, four hundred thousand, eighty-three".