16801840 has 80 divisors (see below), whose sum is σ = 43452576. Its totient is φ = 5990400.

The previous prime is 16801819. The next prime is 16801849. The reversal of 16801840 is 4810861.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 16801799 and 16801808.

It is not an unprimeable number, because it can be changed into a prime (16801849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53524 + ... + 53836.

Almost surely, 2^16801840 is an apocalyptic number.

16801840 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 16801840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21726288).

16801840 is an abundant number, since it is smaller than the sum of its proper divisors (26650736).

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

16801840 is a wasteful number, since it uses less digits than its factorization.

16801840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16801840 is about 4099.0047572551. The cubic root of 16801840 is about 256.1251829167.

The spelling of 16801840 in words is "sixteen million, eight hundred one thousand, eight hundred forty".