31345340 has 48 divisors (see below), whose sum is σ = 73194240. Its totient is φ = 11197440.

The previous prime is 31345339. The next prime is 31345357. The reversal of 31345340 is 4354313.

It is a congruent number.

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, 6116 + ... + 10004.

It is an arithmetic number, because the mean of its divisors is an integer number (1524880).

Almost surely, 2^31345340 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 31345340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36597120).

31345340 is an abundant number, since it is smaller than the sum of its proper divisors (41848900).

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

31345340 is a wasteful number, since it uses less digits than its factorization.

31345340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942 (or 3940 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 31345340 is about 5598.6909184201. The cubic root of 31345340 is about 315.3002595975.

Adding to 31345340 its reverse (4354313), we get a palindrome (35699653).

The spelling of 31345340 in words is "thirty-one million, three hundred forty-five thousand, three hundred forty".