16889645 has 8 divisors (see below), whose sum is σ = 20545656. Its totient is φ = 13326336.

The previous prime is 16889641. The next prime is 16889671. The reversal of 16889645 is 54698861.

16889645 = 265² + 266² + ... + 410².

It can be written as a sum of positive squares in 4 ways, for example, as 1295044 + 15594601 = 1138^2 + 3949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16889645 - 2² = 16889641 is a prime.

It is a super-3 number, since 3×16889645³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16889645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16889641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22772 + ... + 23501.

It is an arithmetic number, because the mean of its divisors is an integer number (2568207).

Almost surely, 2^16889645 is an apocalyptic number.

It is an amenable number.

16889645 is a deficient number, since it is larger than the sum of its proper divisors (3656011).

16889645 is an equidigital number, since it uses as much as digits as its factorization.

16889645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46351.

The product of its digits is 414720, while the sum is 47.

The square root of 16889645 is about 4109.7013273473. The cubic root of 16889645 is about 256.5705708365.

The spelling of 16889645 in words is "sixteen million, eight hundred eighty-nine thousand, six hundred forty-five".