16989476 has 60 divisors (see below), whose sum is σ = 36469020. Its totient is φ = 6914880.

The previous prime is 16989473. The next prime is 16989481. The reversal of 16989476 is 67498961.

It can be written as a sum of positive squares in 2 ways, for example, as 3841600 + 13147876 = 1960^2 + 3626^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (16989473) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 278486 + ... + 278546.

It is an arithmetic number, because the mean of its divisors is an integer number (607817).

Almost surely, 2^16989476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16989476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18234510).

16989476 is an abundant number, since it is smaller than the sum of its proper divisors (19479544).

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

16989476 is an equidigital number, since it uses as much as digits as its factorization.

16989476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 99 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 16989476 is about 4121.8292055834. The cubic root of 16989476 is about 257.0750889613.

The spelling of 16989476 in words is "sixteen million, nine hundred eighty-nine thousand, four hundred seventy-six".