311042240 has 56 divisors (see below), whose sum is σ = 756464832. Its totient is φ = 121763840.

The previous prime is 311042231. The next prime is 311042243. The reversal of 311042240 is 42240113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311042243) 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, 4700 + ... + 25380.

Almost surely, 2^311042240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311042240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378232416).

311042240 is an abundant number, since it is smaller than the sum of its proper divisors (445422592).

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

311042240 is a wasteful number, since it uses less digits than its factorization.

311042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20745 (or 20735 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 311042240 is about 17636.3896532142. The cubic root of 311042240 is about 677.5475672725.

Adding to 311042240 its reverse (42240113), we get a palindrome (353282353).

The spelling of 311042240 in words is "three hundred eleven million, forty-two thousand, two hundred forty".