311212140 has 96 divisors (see below), whose sum is σ = 905397696. Its totient is φ = 79810560.

The previous prime is 311212133. The next prime is 311212141. The reversal of 311212140 is 41212113.

311212140 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (311212141) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 178714 + ... + 180446.

It is an arithmetic number, because the mean of its divisors is an integer number (9431226).

Almost surely, 2^311212140 is an apocalyptic number.

311212140 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 311212140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (452698848).

311212140 is an abundant number, since it is smaller than the sum of its proper divisors (594185556).

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

311212140 is a wasteful number, since it uses less digits than its factorization.

311212140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859 (or 1857 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 311212140 is about 17641.2057411051. The cubic root of 311212140 is about 677.6709099823.

Adding to 311212140 its reverse (41212113), we get a palindrome (352424253).

The spelling of 311212140 in words is "three hundred eleven million, two hundred twelve thousand, one hundred forty".