16978444 has 48 divisors (see below), whose sum is σ = 36687168. Its totient is φ = 6709248.

The previous prime is 16978411. The next prime is 16978459. The reversal of 16978444 is 44487961.

It is a super-2 number, since 2×16978444² = 576535121322272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16978444.

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 15 ways as a sum of consecutive naturals, for example, 24892 + ... + 25564.

It is an arithmetic number, because the mean of its divisors is an integer number (764316).

Almost surely, 2^16978444 is an apocalyptic number.

16978444 is a gapful number since it is divisible by the number (14) 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 16978444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18343584).

16978444 is an abundant number, since it is smaller than the sum of its proper divisors (19708724).

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

16978444 is a wasteful number, since it uses less digits than its factorization.

16978444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754 (or 752 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 16978444 is about 4120.4907474717. The cubic root of 16978444 is about 257.0194335963.

The spelling of 16978444 in words is "sixteen million, nine hundred seventy-eight thousand, four hundred forty-four".