16387189 has 32 divisors (see below), whose sum is σ = 21518336. Its totient is φ = 12130560.

The previous prime is 16387187. The next prime is 16387199. The reversal of 16387189 is 98178361.

It is not a de Polignac number, because 16387189 - 2¹ = 16387187 is a prime.

It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 16387189 = 5³ + 254³ = 197³ + 206³.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16387181) 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 31 ways as a sum of consecutive naturals, for example, 104299 + ... + 104455.

It is an arithmetic number, because the mean of its divisors is an integer number (672448).

Almost surely, 2^16387189 is an apocalyptic number.

It is an amenable number.

16387189 is a deficient number, since it is larger than the sum of its proper divisors (5131147).

16387189 is a wasteful number, since it uses less digits than its factorization.

16387189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245.

The product of its digits is 72576, while the sum is 43.

The square root of 16387189 is about 4048.1093117652. The cubic root of 16387189 is about 254.0006458330. Note that the first 3 decimals are identical.

The spelling of 16387189 in words is "sixteen million, three hundred eighty-seven thousand, one hundred eighty-nine".