18845690 has 24 divisors (see below), whose sum is σ = 36040572. Its totient is φ = 7093760.

The previous prime is 18845683. The next prime is 18845699. The reversal of 18845690 is 9654881.

It can be written as a sum of positive squares in 6 ways, for example, as 17147881 + 1697809 = 4141^2 + 1303^2 .

It is a super-2 number, since 2×18845690² = 710320063152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18845699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371 + ... + 6150.

Almost surely, 2^18845690 is an apocalyptic number.

18845690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18845690 is a deficient number, since it is larger than the sum of its proper divisors (17194882).

18845690 is a wasteful number, since it uses less digits than its factorization.

18845690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562 (or 6545 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 18845690 is about 4341.1622867615. The cubic root of 18845690 is about 266.1158125353.

The spelling of 18845690 in words is "eighteen million, eight hundred forty-five thousand, six hundred ninety".