31320234 has 48 divisors (see below), whose sum is σ = 74412000. Its totient is φ = 9442080.

The previous prime is 31320229. The next prime is 31320251. The reversal of 31320234 is 43202313.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62517 + ... + 63015.

It is an arithmetic number, because the mean of its divisors is an integer number (1550250).

Almost surely, 2^31320234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31320234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37206000).

31320234 is an abundant number, since it is smaller than the sum of its proper divisors (43091766).

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

31320234 is a wasteful number, since it uses less digits than its factorization.

31320234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31320234 is about 5596.4483380087. The cubic root of 31320234 is about 315.2160573665.

Adding to 31320234 its reverse (43202313), we get a palindrome (74522547).

It can be divided in two parts, 313202 and 34, that added together give a triangular number (313236 = T₇₉₁).

The spelling of 31320234 in words is "thirty-one million, three hundred twenty thousand, two hundred thirty-four".