16840440 has 128 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 4337280.

The previous prime is 16840433. The next prime is 16840457. The reversal of 16840440 is 4404861.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33229 + ... + 33731.

It is an arithmetic number, because the mean of its divisors is an integer number (453600).

Almost surely, 2^16840440 is an apocalyptic number.

16840440 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 16840440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030400).

16840440 is an abundant number, since it is smaller than the sum of its proper divisors (41220360).

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

16840440 is a wasteful number, since it uses less digits than its factorization.

16840440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 16840440 is about 4103.7105161061. The cubic root of 16840440 is about 256.3211707924.

It can be divided in two parts, 16 and 840440, that added together give a triangular number (840456 = T₁₂₉₆).

The spelling of 16840440 in words is "sixteen million, eight hundred forty thousand, four hundred forty".