16840640 has 28 divisors (see below), whose sum is σ = 40102536. Its totient is φ = 6736128.

The previous prime is 16840633. The next prime is 16840721. The reversal of 16840640 is 4604861.

16840640 = T₁₅₁ + T₁₅₂ + ... + T₄₇₀.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25994 + ... + 26633.

Almost surely, 2^16840640 is an apocalyptic number.

16840640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16840640 is an abundant number, since it is smaller than the sum of its proper divisors (23261896).

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

16840640 is an equidigital number, since it uses as much as digits as its factorization.

16840640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52644 (or 52634 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 16840640 is about 4103.7348842244. The cubic root of 16840640 is about 256.3221854933.

The spelling of 16840640 in words is "sixteen million, eight hundred forty thousand, six hundred forty".