31745238 has 48 divisors (see below), whose sum is σ = 77757120. Its totient is φ = 8591184.

The previous prime is 31745213. The next prime is 31745261. The reversal of 31745238 is 83254713.

It is a junction number, because it is equal to n+sod(n) for n = 31745199 and 31745208.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 2745 + ... + 8427.

It is an arithmetic number, because the mean of its divisors is an integer number (1619940).

Almost surely, 2^31745238 is an apocalyptic number.

31745238 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31745238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38878560).

31745238 is an abundant number, since it is smaller than the sum of its proper divisors (46011882).

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

31745238 is a wasteful number, since it uses less digits than its factorization.

31745238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5721 (or 5714 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 31745238 is about 5634.2912597770. The cubic root of 31745238 is about 316.6354448750.

The spelling of 31745238 in words is "thirty-one million, seven hundred forty-five thousand, two hundred thirty-eight".