16890840 has 48 divisors (see below), whose sum is σ = 54896400. Its totient is φ = 4504128.

The previous prime is 16890827. The next prime is 16890857. The reversal of 16890840 is 4809861.

It is a happy number.

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 = 16890795 and 16890804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23100 + ... + 23819.

It is an arithmetic number, because the mean of its divisors is an integer number (1143675).

Almost surely, 2^16890840 is an apocalyptic number.

16890840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16890840 is an abundant number, since it is smaller than the sum of its proper divisors (38005560).

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

16890840 is a wasteful number, since it uses less digits than its factorization.

16890840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46936 (or 46929 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 16890840 is about 4109.8467124699. The cubic root of 16890840 is about 256.5766217748.

The spelling of 16890840 in words is "sixteen million, eight hundred ninety thousand, eight hundred forty".