18385790 has 32 divisors (see below), whose sum is σ = 34504704. Its totient is φ = 7045920.

The previous prime is 18385771. The next prime is 18385819. The reversal of 18385790 is 9758381.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 39137 + ... + 39603.

It is an arithmetic number, because the mean of its divisors is an integer number (1078272).

Almost surely, 2^18385790 is an apocalyptic number.

18385790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18385790 is a deficient number, since it is larger than the sum of its proper divisors (16118914).

18385790 is a wasteful number, since it uses less digits than its factorization.

18385790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 18385790 is about 4287.8654363214. The cubic root of 18385790 is about 263.9332456718.

The spelling of 18385790 in words is "eighteen million, three hundred eighty-five thousand, seven hundred ninety".