13087857 has 4 divisors (see below), whose sum is σ = 17450480. Its totient is φ = 8725236.

The previous prime is 13087819. The next prime is 13087861. The reversal of 13087857 is 75878031.

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 not a de Polignac number, because 13087857 - 2⁸ = 13087601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13087157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181307 + ... + 2181312.

It is an arithmetic number, because the mean of its divisors is an integer number (4362620).

Almost surely, 2^13087857 is an apocalyptic number.

It is an amenable number.

13087857 is a deficient number, since it is larger than the sum of its proper divisors (4362623).

13087857 is an equidigital number, since it uses as much as digits as its factorization.

13087857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362622.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 13087857 is about 3617.7143336643. The cubic root of 13087857 is about 235.6619753788.

The spelling of 13087857 in words is "thirteen million, eighty-seven thousand, eight hundred fifty-seven".