16378189 has 2 divisors, whose sum is σ = 16378190. Its totient is φ = 16378188.

The previous prime is 16378181. The next prime is 16378237. The reversal of 16378189 is 98187361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 736164 = 3955^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 16378189 - 2³ = 16378181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16378181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8189094 + 8189095.

It is an arithmetic number, because the mean of its divisors is an integer number (8189095).

Almost surely, 2^16378189 is an apocalyptic number.

It is an amenable number.

16378189 is a deficient number, since it is larger than the sum of its proper divisors (1).

16378189 is an equidigital number, since it uses as much as digits as its factorization.

16378189 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16378189 is about 4046.9975290331. The cubic root of 16378189 is about 253.9541374611.

The spelling of 16378189 in words is "sixteen million, three hundred seventy-eight thousand, one hundred eighty-nine".