16988440 has 128 divisors (see below), whose sum is σ = 47900160. Its totient is φ = 5289984.

The previous prime is 16988399. The next prime is 16988501. The reversal of 16988440 is 4488961.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 16988393 and 16988402.

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, 204639 + ... + 204721.

It is an arithmetic number, because the mean of its divisors is an integer number (374220).

Almost surely, 2^16988440 is an apocalyptic number.

16988440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16988440 is the 2380-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16988440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23950080).

16988440 is an abundant number, since it is smaller than the sum of its proper divisors (30911720).

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

16988440 is a wasteful number, since it uses less digits than its factorization.

16988440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 16988440 is about 4121.7035313084. The cubic root of 16988440 is about 257.0698634674.

The spelling of 16988440 in words is "sixteen million, nine hundred eighty-eight thousand, four hundred forty".