13997789 has 4 divisors (see below), whose sum is σ = 15074556. Its totient is φ = 12921024.

The previous prime is 13997761. The next prime is 13997791. The reversal of 13997789 is 98779931.

13997789 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1452025 + 12545764 = 1205^2 + 3542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13997789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13997789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13997719) 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, 538364 + ... + 538389.

It is an arithmetic number, because the mean of its divisors is an integer number (3768639).

Almost surely, 2^13997789 is an apocalyptic number.

It is an amenable number.

13997789 is a deficient number, since it is larger than the sum of its proper divisors (1076767).

13997789 is a wasteful number, since it uses less digits than its factorization.

13997789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076766.

The product of its digits is 857304, while the sum is 53.

The square root of 13997789 is about 3741.3619178048. The cubic root of 13997789 is about 241.0015380721.

The spelling of 13997789 in words is "thirteen million, nine hundred ninety-seven thousand, seven hundred eighty-nine".