18395990 has 16 divisors (see below), whose sum is σ = 34855920. Its totient is φ = 6971040.

The previous prime is 18395981. The next prime is 18395999. The reversal of 18395990 is 9959381.

It is an interprime number because it is at equal distance from previous prime (18395981) and next prime (18395999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18395999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48221 + ... + 48600.

It is an arithmetic number, because the mean of its divisors is an integer number (2178495).

Almost surely, 2^18395990 is an apocalyptic number.

18395990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18395990 is a deficient number, since it is larger than the sum of its proper divisors (16459930).

18395990 is a wasteful number, since it uses less digits than its factorization.

18395990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96847.

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

The square root of 18395990 is about 4289.0546744009. The cubic root of 18395990 is about 263.9820446160.

The spelling of 18395990 in words is "eighteen million, three hundred ninety-five thousand, nine hundred ninety".