13287789 has 24 divisors (see below), whose sum is σ = 19838520. Its totient is φ = 8566272.

The previous prime is 13287787. The next prime is 13287797. The reversal of 13287789 is 98778231.

13287789 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1764 + 13286025 = 42^2 + 3645^2 .

It is not a de Polignac number, because 13287789 - 2¹ = 13287787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13287787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42297 + ... + 42609.

It is an arithmetic number, because the mean of its divisors is an integer number (826605).

Almost surely, 2^13287789 is an apocalyptic number.

It is an amenable number.

13287789 is a deficient number, since it is larger than the sum of its proper divisors (6550731).

13287789 is a wasteful number, since it uses less digits than its factorization.

13287789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 458 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 13287789 is about 3645.2419672773. The cubic root of 13287789 is about 236.8559184068.

The spelling of 13287789 in words is "thirteen million, two hundred eighty-seven thousand, seven hundred eighty-nine".