31310340 has 48 divisors (see below), whose sum is σ = 88506432. Its totient is φ = 8269696.

The previous prime is 31310317. The next prime is 31310369. The reversal of 31310340 is 4301313.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3982 + ... + 8858.

It is an arithmetic number, because the mean of its divisors is an integer number (1843884).

Almost surely, 2^31310340 is an apocalyptic number.

31310340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31310340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44253216).

31310340 is an abundant number, since it is smaller than the sum of its proper divisors (57196092).

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

31310340 is a wasteful number, since it uses less digits than its factorization.

31310340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4996 (or 4994 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31310340 is about 5595.5643147050. The cubic root of 31310340 is about 315.1828618277.

Adding to 31310340 its reverse (4301313), we get a palindrome (35611653).

The spelling of 31310340 in words is "thirty-one million, three hundred ten thousand, three hundred forty".