311299140 has 24 divisors (see below), whose sum is σ = 871637760. Its totient is φ = 83013088.

The previous prime is 311299139. The next prime is 311299147. The reversal of 311299140 is 41992113.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 311299098 and 311299107.

It is not an unprimeable number, because it can be changed into a prime (311299147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2594100 + ... + 2594219.

It is an arithmetic number, because the mean of its divisors is an integer number (36318240).

Almost surely, 2^311299140 is an apocalyptic number.

311299140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311299140 is an abundant number, since it is smaller than the sum of its proper divisors (560338620).

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

311299140 is a wasteful number, since it uses less digits than its factorization.

311299140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5188331 (or 5188329 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 311299140 is about 17643.6713866474. The cubic root of 311299140 is about 677.7340522022.

The spelling of 311299140 in words is "three hundred eleven million, two hundred ninety-nine thousand, one hundred forty".