18812690 has 32 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 6796224.

The previous prime is 18812683. The next prime is 18812699. The reversal of 18812690 is 9621881.

It is a super-2 number, since 2×18812690² = 707834610072200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18812690.

It is not an unprimeable number, because it can be changed into a prime (18812699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4571 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^18812690 is an apocalyptic number.

18812690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18812690 is a deficient number, since it is larger than the sum of its proper divisors (18442990).

18812690 is a wasteful number, since it uses less digits than its factorization.

18812690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 18812690 is about 4337.3597960049. The cubic root of 18812690 is about 265.9603932210.

The spelling of 18812690 in words is "eighteen million, eight hundred twelve thousand, six hundred ninety".