1272386256 has 60 divisors (see below), whose sum is σ = 3361409856. Its totient is φ = 414552000.

The previous prime is 1272386221. The next prime is 1272386257. The reversal of 1272386256 is 6526832721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272386257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1693881 + ... + 1694631.

Almost surely, 2^1272386256 is an apocalyptic number.

1272386256 is a gapful number since it is divisible by the number (16) 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 1272386256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680704928).

1272386256 is an abundant number, since it is smaller than the sum of its proper divisors (2089023600).

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

1272386256 is an frugal number, since it uses more digits than its factorization.

1272386256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 803 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 1272386256 is about 35670.5236294619. The cubic root of 1272386256 is about 1083.6099639332.

The spelling of 1272386256 in words is "one billion, two hundred seventy-two million, three hundred eighty-six thousand, two hundred fifty-six".