13931789 has 8 divisors (see below), whose sum is σ = 14784120. Its totient is φ = 13083136.

The previous prime is 13931783. The next prime is 13931809. The reversal of 13931789 is 98713931.

It can be written as a sum of positive squares in 4 ways, for example, as 1974025 + 11957764 = 1405^2 + 3458^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13931789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13931783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13247 + ... + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (1848015).

Almost surely, 2^13931789 is an apocalyptic number.

It is an amenable number.

13931789 is a deficient number, since it is larger than the sum of its proper divisors (852331).

13931789 is a wasteful number, since it uses less digits than its factorization.

13931789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839.

The product of its digits is 40824, while the sum is 41.

The square root of 13931789 is about 3732.5311787043. The cubic root of 13931789 is about 240.6221646712.

The spelling of 13931789 in words is "thirteen million, nine hundred thirty-one thousand, seven hundred eighty-nine".