13431947 has 4 divisors (see below), whose sum is σ = 13460016. Its totient is φ = 13403880.

The previous prime is 13431941. The next prime is 13431967. The reversal of 13431947 is 74913431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74913431 = 1609 ⋅46559.

It is a cyclic number.

It is not a de Polignac number, because 13431947 - 2¹⁶ = 13366411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13431941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13304 + ... + 14277.

It is an arithmetic number, because the mean of its divisors is an integer number (3365004).

Almost surely, 2^13431947 is an apocalyptic number.

13431947 is a deficient number, since it is larger than the sum of its proper divisors (28069).

13431947 is an equidigital number, since it uses as much as digits as its factorization.

13431947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28068.

The product of its digits is 9072, while the sum is 32.

The square root of 13431947 is about 3664.9620734736. The cubic root of 13431947 is about 237.7093821116.

The spelling of 13431947 in words is "thirteen million, four hundred thirty-one thousand, nine hundred forty-seven".