18199790 has 32 divisors (see below), whose sum is σ = 38651904. Its totient is φ = 6037920.

The previous prime is 18199771. The next prime is 18199801. The reversal of 18199790 is 9799181.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2024 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (1207872).

Almost surely, 2^18199790 is an apocalyptic number.

18199790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18199790 is an abundant number, since it is smaller than the sum of its proper divisors (20452114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18199790 is a wasteful number, since it uses less digits than its factorization.

18199790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8432.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 18199790 is about 4266.1211890897. The cubic root of 18199790 is about 263.0401997277.

The spelling of 18199790 in words is "eighteen million, one hundred ninety-nine thousand, seven hundred ninety".