13857231 has 4 divisors (see below), whose sum is σ = 18476312. Its totient is φ = 9238152.

The previous prime is 13857229. The next prime is 13857253. The reversal of 13857231 is 13275831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13857231 - 2¹ = 13857229 is a prime.

It is a super-2 number, since 2×13857231² = 384045701974722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13857281) 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, 2309536 + ... + 2309541.

It is an arithmetic number, because the mean of its divisors is an integer number (4619078).

Almost surely, 2^13857231 is an apocalyptic number.

13857231 is a deficient number, since it is larger than the sum of its proper divisors (4619081).

13857231 is an equidigital number, since it uses as much as digits as its factorization.

13857231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4619080.

The product of its digits is 5040, while the sum is 30.

The square root of 13857231 is about 3722.5301879233. The cubic root of 13857231 is about 240.1921551384.

The spelling of 13857231 in words is "thirteen million, eight hundred fifty-seven thousand, two hundred thirty-one".