43471993 has 4 divisors (see below), whose sum is σ = 43486308. Its totient is φ = 43457680.

The previous prime is 43471933. The next prime is 43471999. The reversal of 43471993 is 39917434.

It is a happy number.

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: 39917434 = 2 ⋅19958717.

It can be written as a sum of positive squares in 2 ways, for example, as 7795264 + 35676729 = 2792^2 + 5973^2 .

It is a cyclic number.

It is not a de Polignac number, because 43471993 - 2⁹ = 43471481 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43471999) 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, 598 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (10871577).

It is a vampire number, since it can be written as 4373 ⋅ 9941 (with its own digits).

Almost surely, 2^43471993 is an apocalyptic number.

It is an amenable number.

43471993 is a deficient number, since it is larger than the sum of its proper divisors (14315).

43471993 is an equidigital number, since it uses as much as digits as its factorization.

43471993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14314.

The product of its digits is 81648, while the sum is 40.

The square root of 43471993 is about 6593.3294320851. The cubic root of 43471993 is about 351.6169888073.

It can be divided in two parts, 434 and 71993, that added together give a palindrome (72427).

The spelling of 43471993 in words is "forty-three million, four hundred seventy-one thousand, nine hundred ninety-three".