13839857 has 4 divisors (see below), whose sum is σ = 14286336. Its totient is φ = 13393380.

The previous prime is 13839829. The next prime is 13839869. The reversal of 13839857 is 75893831.

It is a happy number.

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 13839857 - 2¹⁴ = 13823473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13839557) 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, 223193 + ... + 223254.

It is an arithmetic number, because the mean of its divisors is an integer number (3571584).

Almost surely, 2^13839857 is an apocalyptic number.

It is an amenable number.

13839857 is a deficient number, since it is larger than the sum of its proper divisors (446479).

13839857 is an equidigital number, since it uses as much as digits as its factorization.

13839857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446478.

The product of its digits is 181440, while the sum is 44.

The square root of 13839857 is about 3720.1958281789. The cubic root of 13839857 is about 240.0917299819.

The spelling of 13839857 in words is "thirteen million, eight hundred thirty-nine thousand, eight hundred fifty-seven".