1255331440 has 120 divisors (see below), whose sum is σ = 3287383344. Its totient is φ = 445209600.

The previous prime is 1255331431. The next prime is 1255331443. The reversal of 1255331440 is 441335521.

It is a junction number, because it is equal to n+sod(n) for n = 1255331399 and 1255331408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255331443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395299 + ... + 398461.

Almost surely, 2^1255331440 is an apocalyptic number.

1255331440 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 1255331440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643691672).

1255331440 is an abundant number, since it is smaller than the sum of its proper divisors (2032051904).

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

1255331440 is a wasteful number, since it uses less digits than its factorization.

1255331440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239 (or 3222 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1255331440 is about 35430.6567819452. The cubic root of 1255331440 is about 1078.7466713737.

Adding to 1255331440 its reverse (441335521), we get a palindrome (1696666961).

The spelling of 1255331440 in words is "one billion, two hundred fifty-five million, three hundred thirty-one thousand, four hundred forty".