16391789 has 4 divisors (see below), whose sum is σ = 16599360. Its totient is φ = 16184220.

The previous prime is 16391761. The next prime is 16391797. The reversal of 16391789 is 98719361.

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 not a de Polignac number, because 16391789 - 2⁸ = 16391533 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 (16391489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103667 + ... + 103824.

It is an arithmetic number, because the mean of its divisors is an integer number (4149840).

Almost surely, 2^16391789 is an apocalyptic number.

It is an amenable number.

16391789 is a deficient number, since it is larger than the sum of its proper divisors (207571).

16391789 is an equidigital number, since it uses as much as digits as its factorization.

16391789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207570.

The product of its digits is 81648, while the sum is 44.

The square root of 16391789 is about 4048.6774383742. The cubic root of 16391789 is about 254.0244102029.

The spelling of 16391789 in words is "sixteen million, three hundred ninety-one thousand, seven hundred eighty-nine".