1231340320 has 48 divisors (see below), whose sum is σ = 3324621888. Its totient is φ = 422173440.

The previous prime is 1231340309. The next prime is 1231340323. The reversal of 1231340320 is 230431321.

It is not an unprimeable number, because it can be changed into a prime (1231340323) 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 7 ways as a sum of consecutive naturals, for example, 548586 + ... + 550825.

It is an arithmetic number, because the mean of its divisors is an integer number (69262956).

Almost surely, 2^1231340320 is an apocalyptic number.

1231340320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231340320 is an abundant number, since it is smaller than the sum of its proper divisors (2093281568).

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

1231340320 is a wasteful number, since it uses less digits than its factorization.

1231340320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099433 (or 1099425 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1231340320 is about 35090.4591021548. The cubic root of 1231340320 is about 1071.8303084042.

Adding to 1231340320 its reverse (230431321), we get a palindrome (1461771641).

It can be divided in two parts, 1231 and 340320, that added together give a triangular number (341551 = T₈₂₆).

The spelling of 1231340320 in words is "one billion, two hundred thirty-one million, three hundred forty thousand, three hundred twenty".