31710042 has 112 divisors (see below), whose sum is σ = 88139520. Its totient is φ = 8328096.

The previous prime is 31710023. The next prime is 31710043. The reversal of 31710042 is 24001713.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31709997 and 31710024.

It is not an unprimeable number, because it can be changed into a prime (31710043) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 132559 + ... + 132797.

It is an arithmetic number, because the mean of its divisors is an integer number (786960).

Almost surely, 2^31710042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31710042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44069760).

31710042 is an abundant number, since it is smaller than the sum of its proper divisors (56429478).

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

31710042 is a wasteful number, since it uses less digits than its factorization.

31710042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 31710042 is about 5631.1670193664. The cubic root of 31710042 is about 316.5183835148.

Adding to 31710042 its reverse (24001713), we get a palindrome (55711755).

The spelling of 31710042 in words is "thirty-one million, seven hundred ten thousand, forty-two".