13970857 has 4 divisors (see below), whose sum is σ = 14099140. Its totient is φ = 13842576.

The previous prime is 13970851. The next prime is 13970881. The reversal of 13970857 is 75807931.

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 12752041 + 1218816 = 3571^2 + 1104^2 .

It is a cyclic number.

It is not a de Polignac number, because 13970857 - 2¹¹ = 13968809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13970851) 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, 63978 + ... + 64195.

It is an arithmetic number, because the mean of its divisors is an integer number (3524785).

Almost surely, 2^13970857 is an apocalyptic number.

It is an amenable number.

13970857 is a deficient number, since it is larger than the sum of its proper divisors (128283).

13970857 is a wasteful number, since it uses less digits than its factorization.

13970857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128282.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 13970857 is about 3737.7609607892. The cubic root of 13970857 is about 240.8468750609.

The spelling of 13970857 in words is "thirteen million, nine hundred seventy thousand, eight hundred fifty-seven".