18383690 has 16 divisors (see below), whose sum is σ = 35636328. Its totient is φ = 6787776.

The previous prime is 18383689. The next prime is 18383719. The reversal of 18383690 is 9638381.

It can be written as a sum of positive squares in 4 ways, for example, as 14371681 + 4012009 = 3791^2 + 2003^2 .

It is a super-2 number, since 2×18383690² = 675920116032200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70577 + ... + 70836.

Almost surely, 2^18383690 is an apocalyptic number.

18383690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18383690 is a deficient number, since it is larger than the sum of its proper divisors (17252638).

18383690 is a wasteful number, since it uses less digits than its factorization.

18383690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141433.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18383690 is about 4287.6205522411. The cubic root of 18383690 is about 263.9231965901.

The spelling of 18383690 in words is "eighteen million, three hundred eighty-three thousand, six hundred ninety".