18381050 has 12 divisors (see below), whose sum is σ = 34188846. Its totient is φ = 7352400.

The previous prime is 18381049. The next prime is 18381059. The reversal of 18381050 is 5018381.

It can be written as a sum of positive squares in 3 ways, for example, as 13667809 + 4713241 = 3697^2 + 2171^2 .

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18381059) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 183761 + ... + 183860.

Almost surely, 2^18381050 is an apocalyptic number.

18381050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18381050 is a deficient number, since it is larger than the sum of its proper divisors (15807796).

18381050 is a wasteful number, since it uses less digits than its factorization.

18381050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367633 (or 367628 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18381050 is about 4287.3126781237. The cubic root of 18381050 is about 263.9105623730.

The spelling of 18381050 in words is "eighteen million, three hundred eighty-one thousand, fifty".