13287857 has 12 divisors (see below), whose sum is σ = 14707140. Its totient is φ = 11996160.

The previous prime is 13287853. The next prime is 13287877. The reversal of 13287857 is 75878231.

13287857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2686321 + 10601536 = 1639^2 + 3256^2 .

It is not a de Polignac number, because 13287857 - 2² = 13287853 is a prime.

It is a Duffinian number.

Its product of digits (94080) is a multiple of the sum of its prime factors (784).

It is not an unprimeable number, because it can be changed into a prime (13287853) 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 11 ways as a sum of consecutive naturals, for example, 23069 + ... + 23637.

It is an arithmetic number, because the mean of its divisors is an integer number (1225595).

Almost surely, 2^13287857 is an apocalyptic number.

It is an amenable number.

13287857 is a deficient number, since it is larger than the sum of its proper divisors (1419283).

13287857 is a wasteful number, since it uses less digits than its factorization.

13287857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 773 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 13287857 is about 3645.2512944926. The cubic root of 13287857 is about 236.8563224413.

The spelling of 13287857 in words is "thirteen million, two hundred eighty-seven thousand, eight hundred fifty-seven".