13238431 has 4 divisors (see below), whose sum is σ = 13248792. Its totient is φ = 13228072.

The previous prime is 13238411. The next prime is 13238437. The reversal of 13238431 is 13483231.

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: 13483231 = 29 ⋅464939.

It is a cyclic number.

It is not a de Polignac number, because 13238431 - 2⁵ = 13238399 is a prime.

It is a super-2 number, since 2×13238431² = 350512110683522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13238396 and 13238405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13238437) 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, 2941 + ... + 5926.

It is an arithmetic number, because the mean of its divisors is an integer number (3312198).

Almost surely, 2^13238431 is an apocalyptic number.

13238431 is a deficient number, since it is larger than the sum of its proper divisors (10361).

13238431 is an equidigital number, since it uses as much as digits as its factorization.

13238431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10360.

The product of its digits is 1728, while the sum is 25.

The square root of 13238431 is about 3638.4654732456. The cubic root of 13238431 is about 236.5622844147.

The spelling of 13238431 in words is "thirteen million, two hundred thirty-eight thousand, four hundred thirty-one".