31043120 has 40 divisors (see below), whose sum is σ = 72624816. Its totient is φ = 12339968.

The previous prime is 31043101. The next prime is 31043141. The reversal of 31043120 is 2134013.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 31043095 and 31043104.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12719 + ... + 14961.

Almost surely, 2^31043120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31043120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36312408).

31043120 is an abundant number, since it is smaller than the sum of its proper divisors (41581696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31043120 is a wasteful number, since it uses less digits than its factorization.

31043120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31043120 is about 5571.6353075197. The cubic root of 31043120 is about 314.2836497306.

Adding to 31043120 its reverse (2134013), we get a palindrome (33177133).

The spelling of 31043120 in words is "thirty-one million, forty-three thousand, one hundred twenty".