16440889 has 4 divisors (see below), whose sum is σ = 16639056. Its totient is φ = 16242724.

The previous prime is 16440869. The next prime is 16440899. The reversal of 16440889 is 98804461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16440889 - 2⁵ = 16440857 is a prime.

It is a super-3 number, since 3×16440889³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16440829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98959 + ... + 99124.

It is an arithmetic number, because the mean of its divisors is an integer number (4159764).

Almost surely, 2^16440889 is an apocalyptic number.

It is an amenable number.

16440889 is a deficient number, since it is larger than the sum of its proper divisors (198167).

16440889 is an equidigital number, since it uses as much as digits as its factorization.

16440889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198166.

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

The square root of 16440889 is about 4054.7366129010. The cubic root of 16440889 is about 254.2777924652.

The spelling of 16440889 in words is "sixteen million, four hundred forty thousand, eight hundred eighty-nine".