1255791240 has 288 divisors, whose sum is σ = 4541322240. Its totient is φ = 300706560.

The previous prime is 1255791239. The next prime is 1255791287. The reversal of 1255791240 is 421975521.

1255791240 is a `hidden beast` number, since 12 + 557 + 91 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1255791195 and 1255791204.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5532007 + ... + 5532233.

It is an arithmetic number, because the mean of its divisors is an integer number (15768480).

Almost surely, 2^1255791240 is an apocalyptic number.

1255791240 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 1255791240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270661120).

1255791240 is an abundant number, since it is smaller than the sum of its proper divisors (3285531000).

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

1255791240 is a wasteful number, since it uses less digits than its factorization.

1255791240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 1255791240 is about 35437.1449188560. The cubic root of 1255791240 is about 1078.8783622715.

The spelling of 1255791240 in words is "one billion, two hundred fifty-five million, seven hundred ninety-one thousand, two hundred forty".