231311340 has 144 divisors (see below), whose sum is σ = 774367776. Its totient is φ = 55526400.

The previous prime is 231311287. The next prime is 231311357. The reversal of 231311340 is 43113132.

231311340 is a `hidden beast` number, since 2 + 313 + 11 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94735 + ... + 97145.

It is an arithmetic number, because the mean of its divisors is an integer number (5377554).

Almost surely, 2^231311340 is an apocalyptic number.

231311340 is a gapful number since it is divisible by the number (20) 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 231311340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387183888).

231311340 is an abundant number, since it is smaller than the sum of its proper divisors (543056436).

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

231311340 is a wasteful number, since it uses less digits than its factorization.

231311340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480 (or 2475 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231311340 is about 15208.9230387954. The cubic root of 231311340 is about 613.8547793231.

Adding to 231311340 its reverse (43113132), we get a palindrome (274424472).

The spelling of 231311340 in words is "two hundred thirty-one million, three hundred eleven thousand, three hundred forty".