18428840 has 16 divisors (see below), whose sum is σ = 41464980. Its totient is φ = 7371520.

The previous prime is 18428807. The next prime is 18428857. The reversal of 18428840 is 4882481.

It can be written as a sum of positive squares in 2 ways, for example, as 18164644 + 264196 = 4262^2 + 514^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18428840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230321 + ... + 230400.

Almost surely, 2^18428840 is an apocalyptic number.

18428840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18428840 is an abundant number, since it is smaller than the sum of its proper divisors (23036140).

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

18428840 is a wasteful number, since it uses less digits than its factorization.

18428840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460732 (or 460728 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 18428840 is about 4292.8824815035. The cubic root of 18428840 is about 264.1390834323.

The spelling of 18428840 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred forty".