1231332140 has 72 divisors (see below), whose sum is σ = 2722273008. Its totient is φ = 467786880.

The previous prime is 1231332119. The next prime is 1231332169. The reversal of 1231332140 is 412331321.

It is a super-3 number, since 3×1231332140³ (a number of 28 digits) contains 333 as substring.

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1914659 + ... + 1915301.

Almost surely, 2^1231332140 is an apocalyptic number.

1231332140 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 1231332140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361136504).

1231332140 is an abundant number, since it is smaller than the sum of its proper divisors (1490940868).

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

1231332140 is a wasteful number, since it uses less digits than its factorization.

1231332140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1231332140 is about 35090.3425460624. The cubic root of 1231332140 is about 1071.8279349495.

Adding to 1231332140 its reverse (412331321), we get a palindrome (1643663461).

The spelling of 1231332140 in words is "one billion, two hundred thirty-one million, three hundred thirty-two thousand, one hundred forty".