1231755940 has 48 divisors (see below), whose sum is σ = 2729099520. Its totient is φ = 465696000.

The previous prime is 1231755929. The next prime is 1231755977. The reversal of 1231755940 is 495571321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231755940.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172440 + ... + 179440.

It is an arithmetic number, because the mean of its divisors is an integer number (56856240).

Almost surely, 2^1231755940 is an apocalyptic number.

1231755940 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 1231755940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364549760).

1231755940 is an abundant number, since it is smaller than the sum of its proper divisors (1497343580).

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

1231755940 is a wasteful number, since it uses less digits than its factorization.

1231755940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7492 (or 7490 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 1231755940 is about 35096.3807250833. The cubic root of 1231755940 is about 1071.9508881210.

The spelling of 1231755940 in words is "one billion, two hundred thirty-one million, seven hundred fifty-five thousand, nine hundred forty".