1247495256 has 160 divisors (see below), whose sum is σ = 4101783840. Its totient is φ = 346747392.

The previous prime is 1247495243. The next prime is 1247495257. The reversal of 1247495256 is 6525947421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247495257) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 164116 + ... + 171548.

It is an arithmetic number, because the mean of its divisors is an integer number (25636149).

Almost surely, 2^1247495256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247495256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2050891920).

1247495256 is an abundant number, since it is smaller than the sum of its proper divisors (2854288584).

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

1247495256 is a wasteful number, since it uses less digits than its factorization.

1247495256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7495 (or 7482 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 1247495256 is about 35319.8988673524. The cubic root of 1247495256 is about 1076.4973562498.

The spelling of 1247495256 in words is "one billion, two hundred forty-seven million, four hundred ninety-five thousand, two hundred fifty-six".