16818840 has 160 divisors (see below), whose sum is σ = 58806000. Its totient is φ = 4306176.

The previous prime is 16818821. The next prime is 16818853. The reversal of 16818840 is 4881861.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16818795 and 16818804.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 93871 + ... + 94049.

Almost surely, 2^16818840 is an apocalyptic number.

16818840 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 16818840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29403000).

16818840 is an abundant number, since it is smaller than the sum of its proper divisors (41987160).

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

16818840 is a wasteful number, since it uses less digits than its factorization.

16818840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 16818840 is about 4101.0779070874. The cubic root of 16818840 is about 256.2115357694.

The spelling of 16818840 in words is "sixteen million, eight hundred eighteen thousand, eight hundred forty".