16670889 has 9 divisors (see below), whose sum is σ = 24097879. Its totient is φ = 11105760.

The previous prime is 16670881. The next prime is 16670939. The reversal of 16670889 is 98807661.

It is a happy number.

The square root of 16670889 is 4083.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2832489 + 13838400 = 1683^2 + 3720^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 16670889 - 2³ = 16670881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16670881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11569 + ... + 12929.

Almost surely, 2^16670889 is an apocalyptic number.

16670889 is the 4083-rd square number.

16670889 is the 2042-nd centered octagonal number.

It is an amenable number.

16670889 is a deficient number, since it is larger than the sum of its proper divisors (7426990).

16670889 is an frugal number, since it uses more digits than its factorization.

16670889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The cubic root of 16670889 is about 255.4580464023.

The spelling of 16670889 in words is "sixteen million, six hundred seventy thousand, eight hundred eighty-nine".