18189690 has 16 divisors (see below), whose sum is σ = 43655328. Its totient is φ = 4850576.

The previous prime is 18189683. The next prime is 18189701. The reversal of 18189690 is 9698181.

It is a super-2 number, since 2×18189690² = 661729644592200, which contains 22 as substring.

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

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 303132 + ... + 303191.

It is an arithmetic number, because the mean of its divisors is an integer number (2728458).

Almost surely, 2^18189690 is an apocalyptic number.

18189690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18189690 is an abundant number, since it is smaller than the sum of its proper divisors (25465638).

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

18189690 is a wasteful number, since it uses less digits than its factorization.

18189690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606333.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 18189690 is about 4264.9372797264. The cubic root of 18189690 is about 262.9915325431.

The spelling of 18189690 in words is "eighteen million, one hundred eighty-nine thousand, six hundred ninety".