16408189 has 6 divisors (see below), whose sum is σ = 19087134. Its totient is φ = 14064120.

The previous prime is 16408181. The next prime is 16408199. The reversal of 16408189 is 98180461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 2592100 = 3717^2 + 1610^2 .

It is not a de Polignac number, because 16408189 - 2³ = 16408181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16408181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 167382 + ... + 167479.

It is an arithmetic number, because the mean of its divisors is an integer number (3181189).

Almost surely, 2^16408189 is an apocalyptic number.

It is an amenable number.

16408189 is a deficient number, since it is larger than the sum of its proper divisors (2678945).

16408189 is an equidigital number, since it uses as much as digits as its factorization.

16408189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334875 (or 334868 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 16408189 is about 4050.7022847896. The cubic root of 16408189 is about 254.1090991842.

The spelling of 16408189 in words is "sixteen million, four hundred eight thousand, one hundred eighty-nine".