311242340 has 24 divisors (see below), whose sum is σ = 655143552. Its totient is φ = 124204640.

The previous prime is 311242333. The next prime is 311242343. The reversal of 311242340 is 43242113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (311242343) 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 7 ways as a sum of consecutive naturals, for example, 9434 + ... + 26673.

It is an arithmetic number, because the mean of its divisors is an integer number (27297648).

Almost surely, 2^311242340 is an apocalyptic number.

It is an amenable number.

311242340 is an abundant number, since it is smaller than the sum of its proper divisors (343901212).

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

311242340 is a wasteful number, since it uses less digits than its factorization.

311242340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36547 (or 36545 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 311242340 is about 17642.0616709046. The cubic root of 311242340 is about 677.6928296494.

Adding to 311242340 its reverse (43242113), we get a palindrome (354484453).

The spelling of 311242340 in words is "three hundred eleven million, two hundred forty-two thousand, three hundred forty".