16788389 has 2 divisors, whose sum is σ = 16788390. Its totient is φ = 16788388.

The previous prime is 16788383. The next prime is 16788397. The reversal of 16788389 is 98388761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 1304164 = 3935^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 16788389 - 2⁸ = 16788133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16788383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8394194 + 8394195.

It is an arithmetic number, because the mean of its divisors is an integer number (8394195).

Almost surely, 2^16788389 is an apocalyptic number.

It is an amenable number.

16788389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16788389 is an equidigital number, since it uses as much as digits as its factorization.

16788389 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16788389 is about 4097.3636646019. The cubic root of 16788389 is about 256.0568162061.

The spelling of 16788389 in words is "sixteen million, seven hundred eighty-eight thousand, three hundred eighty-nine".