13431447 has 8 divisors (see below), whose sum is σ = 19898480. Its totient is φ = 8954280.

The previous prime is 13431433. The next prime is 13431497. The reversal of 13431447 is 74413431.

It is not a de Polignac number, because 13431447 - 2⁸ = 13431191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 497461 = 13431447 / (1 + 3 + 4 + 3 + 1 + 4 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13431447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248704 + ... + 248757.

It is an arithmetic number, because the mean of its divisors is an integer number (2487310).

Almost surely, 2^13431447 is an apocalyptic number.

13431447 is a deficient number, since it is larger than the sum of its proper divisors (6467033).

13431447 is an equidigital number, since it uses as much as digits as its factorization.

13431447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497470 (or 497464 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 13431447 is about 3664.8938593089. The cubic root of 13431447 is about 237.7064325227.

Adding to 13431447 its reverse (74413431), we get a palindrome (87844878).

The spelling of 13431447 in words is "thirteen million, four hundred thirty-one thousand, four hundred forty-seven".