13143857 has 4 divisors (see below), whose sum is σ = 13166400. Its totient is φ = 13121316.

The previous prime is 13143847. The next prime is 13143881. The reversal of 13143857 is 75834131.

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 a cyclic number.

It is not a de Polignac number, because 13143857 - 2¹⁴ = 13127473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13143817) 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 3 ways as a sum of consecutive naturals, for example, 10373 + ... + 11570.

It is an arithmetic number, because the mean of its divisors is an integer number (3291600).

Almost surely, 2^13143857 is an apocalyptic number.

It is an amenable number.

13143857 is a deficient number, since it is larger than the sum of its proper divisors (22543).

13143857 is an equidigital number, since it uses as much as digits as its factorization.

13143857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22542.

The product of its digits is 10080, while the sum is 32.

The square root of 13143857 is about 3625.4457656956. The cubic root of 13143857 is about 235.9976120126.

Adding to 13143857 its reverse (75834131), we get a palindrome (88977988).

The spelling of 13143857 in words is "thirteen million, one hundred forty-three thousand, eight hundred fifty-seven".