13897231 has 4 divisors (see below), whose sum is σ = 13905864. Its totient is φ = 13888600.

The previous prime is 13897223. The next prime is 13897241. The reversal of 13897231 is 13279831.

13897231 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13279831 = 179 ⋅74189.

It is a cyclic number.

It is not a de Polignac number, because 13897231 - 2³ = 13897223 is a prime.

It is a super-2 number, since 2×13897231² = 386266058934722, 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 (13897241) 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, 1105 + ... + 5386.

It is an arithmetic number, because the mean of its divisors is an integer number (3476466).

Almost surely, 2^13897231 is an apocalyptic number.

13897231 is a deficient number, since it is larger than the sum of its proper divisors (8633).

13897231 is an equidigital number, since it uses as much as digits as its factorization.

13897231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8632.

The product of its digits is 9072, while the sum is 34.

The square root of 13897231 is about 3727.8990061427. The cubic root of 13897231 is about 240.4230443772.

The spelling of 13897231 in words is "thirteen million, eight hundred ninety-seven thousand, two hundred thirty-one".