31340443 has 16 divisors (see below), whose sum is σ = 34276000. Its totient is φ = 28553472.

The previous prime is 31340423. The next prime is 31340447. The reversal of 31340443 is 34404313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31340443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31340447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76423 + ... + 76831.

It is an arithmetic number, because the mean of its divisors is an integer number (2142250).

Almost surely, 2^31340443 is an apocalyptic number.

31340443 is a deficient number, since it is larger than the sum of its proper divisors (2935557).

31340443 is a wasteful number, since it uses less digits than its factorization.

31340443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 31340443 is about 5598.2535669618. The cubic root of 31340443 is about 315.2838392323.

Adding to 31340443 its reverse (34404313), we get a palindrome (65744756).

The spelling of 31340443 in words is "thirty-one million, three hundred forty thousand, four hundred forty-three".