31303140 has 96 divisors (see below), whose sum is σ = 97929216. Its totient is φ = 7405440.

The previous prime is 31303133. The next prime is 31303157. The reversal of 31303140 is 4130313.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27829 + ... + 28931.

It is an arithmetic number, because the mean of its divisors is an integer number (1020096).

Almost surely, 2^31303140 is an apocalyptic number.

31303140 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 31303140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48964608).

31303140 is an abundant number, since it is smaller than the sum of its proper divisors (66626076).

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

31303140 is a wasteful number, since it uses less digits than its factorization.

31303140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169 (or 1167 counting only the distinct ones).

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

The square root of 31303140 is about 5594.9209109692. The cubic root of 31303140 is about 315.1587005807.

Adding to 31303140 its reverse (4130313), we get a palindrome (35433453).

The spelling of 31303140 in words is "thirty-one million, three hundred three thousand, one hundred forty".