18880840 has 96 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 6638720.

The previous prime is 18880819. The next prime is 18880843. The reversal of 18880840 is 4808881.

It is a super-2 number, since 2×18880840² = 712972238211200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18880840.

It is not an unprimeable number, because it can be changed into a prime (18880843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227439 + ... + 227521.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^18880840 is an apocalyptic number.

18880840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18880840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24131520).

18880840 is an abundant number, since it is smaller than the sum of its proper divisors (29382200).

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

18880840 is a wasteful number, since it uses less digits than its factorization.

18880840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 37.

The square root of 18880840 is about 4345.2088557398. The cubic root of 18880840 is about 266.2811582335.

The spelling of 18880840 in words is "eighteen million, eight hundred eighty thousand, eight hundred forty".