1287374856 has 32 divisors (see below), whose sum is σ = 3262529760. Its totient is φ = 423245952.

The previous prime is 1287374843. The next prime is 1287374857. The reversal of 1287374856 is 6584737821.

It is a super-2 number, since 2×1287374856² = 3314668039722041472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1287374799 and 1287374808.

It is not an unprimeable number, because it can be changed into a prime (1287374857) 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 7 ways as a sum of consecutive naturals, for example, 365650 + ... + 369153.

It is an arithmetic number, because the mean of its divisors is an integer number (101954055).

Almost surely, 2^1287374856 is an apocalyptic number.

It is an amenable number.

1287374856 is an abundant number, since it is smaller than the sum of its proper divisors (1975154904).

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

1287374856 is a wasteful number, since it uses less digits than its factorization.

1287374856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734885 (or 734881 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 1287374856 is about 35880.0063545145. The cubic root of 1287374856 is about 1087.8483086709.

The spelling of 1287374856 in words is "one billion, two hundred eighty-seven million, three hundred seventy-four thousand, eight hundred fifty-six".