31032140 has 48 divisors (see below), whose sum is σ = 69727392. Its totient is φ = 11559936.

The previous prime is 31032139. The next prime is 31032151. The reversal of 31032140 is 4123013.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35954 + ... + 36806.

It is an arithmetic number, because the mean of its divisors is an integer number (1452654).

Almost surely, 2^31032140 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 31032140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34863696).

31032140 is an abundant number, since it is smaller than the sum of its proper divisors (38695252).

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

31032140 is a wasteful number, since it uses less digits than its factorization.

31032140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 984 counting only the distinct ones).

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

The square root of 31032140 is about 5570.6498723219. The cubic root of 31032140 is about 314.2465911552.

Adding to 31032140 its reverse (4123013), we get a palindrome (35155153).

The spelling of 31032140 in words is "thirty-one million, thirty-two thousand, one hundred forty".