18840690 has 48 divisors (see below), whose sum is σ = 53441856. Its totient is φ = 4567200.

The previous prime is 18840671. The next prime is 18840697. The reversal of 18840690 is 9604881.

It is a happy number.

It is a super-2 number, since 2×18840690² = 709943199352200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18840697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8526 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (1113372).

Almost surely, 2^18840690 is an apocalyptic number.

18840690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18840690 is an abundant number, since it is smaller than the sum of its proper divisors (34601166).

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

18840690 is a wasteful number, since it uses less digits than its factorization.

18840690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19055 (or 19052 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18840690 is about 4340.5863659188. The cubic root of 18840690 is about 266.0922758229.

The spelling of 18840690 in words is "eighteen million, eight hundred forty thousand, six hundred ninety".