16989570 has 72 divisors (see below), whose sum is σ = 47874996. Its totient is φ = 4178304.

The previous prime is 16989569. The next prime is 16989593. The reversal of 16989570 is 7598961.

It can be written as a sum of positive squares in 6 ways, for example, as 23409 + 16966161 = 153^2 + 4119^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14652 + ... + 15768.

Almost surely, 2^16989570 is an apocalyptic number.

16989570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16989570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23937498).

16989570 is an abundant number, since it is smaller than the sum of its proper divisors (30885426).

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

16989570 is a wasteful number, since it uses less digits than its factorization.

16989570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 16989570 is about 4121.8406082720. The cubic root of 16989570 is about 257.0755630786.

The spelling of 16989570 in words is "sixteen million, nine hundred eighty-nine thousand, five hundred seventy".