16890440 has 64 divisors (see below), whose sum is σ = 43804800. Its totient is φ = 5741568.

The previous prime is 16890439. The next prime is 16890451. The reversal of 16890440 is 4409861.

It is a junction number, because it is equal to n+sod(n) for n = 16890397 and 16890406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49952 + ... + 50288.

It is an arithmetic number, because the mean of its divisors is an integer number (684450).

Almost surely, 2^16890440 is an apocalyptic number.

16890440 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 16890440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21902400).

16890440 is an abundant number, since it is smaller than the sum of its proper divisors (26914360).

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

16890440 is a wasteful number, since it uses less digits than its factorization.

16890440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 16890440 is about 4109.7980485664. The cubic root of 16890440 is about 256.5745963879.

The spelling of 16890440 in words is "sixteen million, eight hundred ninety thousand, four hundred forty".