13388431 has 4 divisors (see below), whose sum is σ = 15301072. Its totient is φ = 11475792.

The previous prime is 13388429. The next prime is 13388443. The reversal of 13388431 is 13488331.

13388431 is digitally balanced in base 2 and base 8, because in such bases 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 an emirpimes, since its reverse is a distinct semiprime: 13488331 = 1429 ⋅9439.

It is a cyclic number.

It is not a de Polignac number, because 13388431 - 2¹ = 13388429 is a prime.

It is a super-2 number, since 2×13388431² = 358500169283522, which contains 22 as substring.

It is a Duffinian number.

13388431 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 13388393 and 13388402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13388411) 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, 956310 + ... + 956323.

It is an arithmetic number, because the mean of its divisors is an integer number (3825268).

Almost surely, 2^13388431 is an apocalyptic number.

13388431 is a deficient number, since it is larger than the sum of its proper divisors (1912641).

13388431 is an equidigital number, since it uses as much as digits as its factorization.

13388431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912640.

The product of its digits is 6912, while the sum is 31.

The square root of 13388431 is about 3659.0204973463. The cubic root of 13388431 is about 237.4523989551.

The spelling of 13388431 in words is "thirteen million, three hundred eighty-eight thousand, four hundred thirty-one".