31273242 has 128 divisors (see below), whose sum is σ = 86704128. Its totient is φ = 7257600.

The previous prime is 31273241. The next prime is 31273243. The reversal of 31273242 is 24237213.

It is an interprime number because it is at equal distance from previous prime (31273241) and next prime (31273243).

It is not an unprimeable number, because it can be changed into a prime (31273241) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 246183 + ... + 246309.

It is an arithmetic number, because the mean of its divisors is an integer number (677376).

Almost surely, 2^31273242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31273242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43352064).

31273242 is an abundant number, since it is smaller than the sum of its proper divisors (55430886).

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

31273242 is a wasteful number, since it uses less digits than its factorization.

31273242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its digits is 2016, while the sum is 24.

The square root of 31273242 is about 5592.2483850416. The cubic root of 31273242 is about 315.0583313493.

The spelling of 31273242 in words is "thirty-one million, two hundred seventy-three thousand, two hundred forty-two".