18609690 has 32 divisors (see below), whose sum is σ = 48724416. Its totient is φ = 4511360.

The previous prime is 18609673. The next prime is 18609707. The reversal of 18609690 is 9690681.

It is an interprime number because it is at equal distance from previous prime (18609673) and next prime (18609707).

It is a super-2 number, since 2×18609690² = 692641123792200, 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, 27867 + ... + 28526.

It is an arithmetic number, because the mean of its divisors is an integer number (1522638).

Almost surely, 2^18609690 is an apocalyptic number.

18609690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18609690 is an abundant number, since it is smaller than the sum of its proper divisors (30114726).

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

18609690 is a wasteful number, since it uses less digits than its factorization.

18609690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56414.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 18609690 is about 4313.8949917679. The cubic root of 18609690 is about 265.0003085317. Note that the first 3 decimals are identical.

The spelling of 18609690 in words is "eighteen million, six hundred nine thousand, six hundred ninety".