16378889 has 4 divisors (see below), whose sum is σ = 16727424. Its totient is φ = 16030356.

The previous prime is 16378861. The next prime is 16378891. The reversal of 16378889 is 98887361.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-16378889 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 (16378849) 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 3 ways as a sum of consecutive naturals, for example, 174197 + ... + 174290.

It is an arithmetic number, because the mean of its divisors is an integer number (4181856).

Almost surely, 2^16378889 is an apocalyptic number.

It is an amenable number.

16378889 is a deficient number, since it is larger than the sum of its proper divisors (348535).

16378889 is an equidigital number, since it uses as much as digits as its factorization.

16378889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348534.

The product of its digits is 580608, while the sum is 50.

The square root of 16378889 is about 4047.0840119770. The cubic root of 16378889 is about 253.9577553899.

The spelling of 16378889 in words is "sixteen million, three hundred seventy-eight thousand, eight hundred eighty-nine".