31980843 has 6 divisors (see below), whose sum is σ = 46194564. Its totient is φ = 21320556.

The previous prime is 31980749. The next prime is 31980853. The reversal of 31980843 is 34808913.

It is not a de Polignac number, because 31980843 - 2⁹ = 31980331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31980798 and 31980807.

It is not an unprimeable number, because it can be changed into a prime (31980853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1776705 + ... + 1776722.

It is an arithmetic number, because the mean of its divisors is an integer number (7699094).

Almost surely, 2^31980843 is an apocalyptic number.

31980843 is a deficient number, since it is larger than the sum of its proper divisors (14213721).

31980843 is a wasteful number, since it uses less digits than its factorization.

31980843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553433 (or 3553430 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 31980843 is about 5655.1607404211. The cubic root of 31980843 is about 317.4168439096.

It can be divided in two parts, 31980 and 843, that added together give a palindrome (32823).

The spelling of 31980843 in words is "thirty-one million, nine hundred eighty thousand, eight hundred forty-three".