18840840 has 32 divisors (see below), whose sum is σ = 56522880. Its totient is φ = 5024192.

The previous prime is 18840817. The next prime is 18840847. The reversal of 18840840 is 4804881.

It is not an unprimeable number, because it can be changed into a prime (18840847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78384 + ... + 78623.

It is an arithmetic number, because the mean of its divisors is an integer number (1766340).

Almost surely, 2^18840840 is an apocalyptic number.

18840840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18840840 is an abundant number, since it is smaller than the sum of its proper divisors (37682040).

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

18840840 is a wasteful number, since it uses less digits than its factorization.

18840840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157021 (or 157017 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 18840840 is about 4340.6036446559. The cubic root of 18840840 is about 266.0929819849.

The spelling of 18840840 in words is "eighteen million, eight hundred forty thousand, eight hundred forty".