16943640 has 128 divisors (see below), whose sum is σ = 60687360. Its totient is φ = 3700224.

The previous prime is 16943621. The next prime is 16943651. The reversal of 16943640 is 4634961.

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 31 ways as a sum of consecutive naturals, for example, 18882 + ... + 19758.

It is an arithmetic number, because the mean of its divisors is an integer number (474120).

Almost surely, 2^16943640 is an apocalyptic number.

16943640 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 16943640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30343680).

16943640 is an abundant number, since it is smaller than the sum of its proper divisors (43743720).

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

16943640 is a wasteful number, since it uses less digits than its factorization.

16943640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 917 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 16943640 is about 4116.2652975725. The cubic root of 16943640 is about 256.8436926461.

The spelling of 16943640 in words is "sixteen million, nine hundred forty-three thousand, six hundred forty".