13047857 has 4 divisors (see below), whose sum is σ = 13815396. Its totient is φ = 12280320.

The previous prime is 13047829. The next prime is 13047863. The reversal of 13047857 is 75874031.

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 10962721 + 2085136 = 3311^2 + 1444^2 .

It is a cyclic number.

It is not a de Polignac number, because 13047857 - 2¹⁰ = 13046833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13047817) 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, 383744 + ... + 383777.

It is an arithmetic number, because the mean of its divisors is an integer number (3453849).

Almost surely, 2^13047857 is an apocalyptic number.

13047857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13047857 is a deficient number, since it is larger than the sum of its proper divisors (767539).

13047857 is an equidigital number, since it uses as much as digits as its factorization.

13047857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767538.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 13047857 is about 3612.1817506875. The cubic root of 13047857 is about 235.4216483174.

The spelling of 13047857 in words is "thirteen million, forty-seven thousand, eight hundred fifty-seven".