18380890 has 16 divisors (see below), whose sum is σ = 36093600. Its totient is φ = 6683920.

The previous prime is 18380881. The next prime is 18380899. The reversal of 18380890 is 9808381.

It is an interprime number because it is at equal distance from previous prime (18380881) and next prime (18380899).

It is not an unprimeable number, because it can be changed into a prime (18380899) 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 7 ways as a sum of consecutive naturals, for example, 83440 + ... + 83659.

It is an arithmetic number, because the mean of its divisors is an integer number (2255850).

Almost surely, 2^18380890 is an apocalyptic number.

18380890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18380890 is a deficient number, since it is larger than the sum of its proper divisors (17712710).

18380890 is a wasteful number, since it uses less digits than its factorization.

18380890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167117.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18380890 is about 4287.2940183757. The cubic root of 18380890 is about 263.9097966239.

The spelling of 18380890 in words is "eighteen million, three hundred eighty thousand, eight hundred ninety".