1231200340 has 48 divisors (see below), whose sum is σ = 2675312640. Its totient is φ = 475453440.

The previous prime is 1231200331. The next prime is 1231200343. The reversal of 1231200340 is 430021321.

It is a happy number.

It is a super-2 number, since 2×1231200340² = 3031708554432231200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231200343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284916 + ... + 289204.

It is an arithmetic number, because the mean of its divisors is an integer number (55735680).

Almost surely, 2^1231200340 is an apocalyptic number.

1231200340 is a gapful number since it is divisible by the number (10) 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 1231200340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1337656320).

1231200340 is an abundant number, since it is smaller than the sum of its proper divisors (1444112300).

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

1231200340 is a wasteful number, since it uses less digits than its factorization.

1231200340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4792 (or 4790 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1231200340 is about 35088.4644862097. The cubic root of 1231200340 is about 1071.7896912843.

Adding to 1231200340 its reverse (430021321), we get a palindrome (1661221661).

The spelling of 1231200340 in words is "one billion, two hundred thirty-one million, two hundred thousand, three hundred forty".