1286255856 has 20 divisors (see below), whose sum is σ = 3322827752. Its totient is φ = 428751936.

The previous prime is 1286255851. The next prime is 1286255899. The reversal of 1286255856 is 6585526821.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 26796997 = 1286255856 / (1 + 2 + 8 + 6 + 2 + 5 + 5 + 8 + 5 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286255851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13398451 + ... + 13398546.

Almost surely, 2^1286255856 is an apocalyptic number.

1286255856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1286255856 is an abundant number, since it is smaller than the sum of its proper divisors (2036571896).

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

1286255856 is a wasteful number, since it uses less digits than its factorization.

1286255856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26797008 (or 26797002 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 48.

The square root of 1286255856 is about 35864.4093217775. The cubic root of 1286255856 is about 1087.5330275080.

The spelling of 1286255856 in words is "one billion, two hundred eighty-six million, two hundred fifty-five thousand, eight hundred fifty-six".