18809690 has 32 divisors (see below), whose sum is σ = 35992080. Its totient is φ = 7064064.

The previous prime is 18809683. The next prime is 18809723. The reversal of 18809690 is 9690881.

It can be written as a sum of positive squares in 8 ways, for example, as 6817321 + 11992369 = 2611^2 + 3463^2 .

It is a super-2 number, since 2×18809690² = 707608875792200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9854 + ... + 11606.

Almost surely, 2^18809690 is an apocalyptic number.

18809690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18809690 is a deficient number, since it is larger than the sum of its proper divisors (17182390).

18809690 is a wasteful number, since it uses less digits than its factorization.

18809690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 18809690 is about 4337.0139497124. The cubic root of 18809690 is about 265.9462551827.

The spelling of 18809690 in words is "eighteen million, eight hundred nine thousand, six hundred ninety".