1381586856 has 32 divisors (see below), whose sum is σ = 3719657760. Its totient is φ = 425103552.

The previous prime is 1381586851. The next prime is 1381586863. The reversal of 1381586856 is 6586851831.

It is a junction number, because it is equal to n+sod(n) for n = 1381586799 and 1381586808.

It is not an unprimeable number, because it can be changed into a prime (1381586851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213770 + ... + 2214393.

It is an arithmetic number, because the mean of its divisors is an integer number (116239305).

Almost surely, 2^1381586856 is an apocalyptic number.

It is an amenable number.

1381586856 is an abundant number, since it is smaller than the sum of its proper divisors (2338070904).

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

1381586856 is a wasteful number, since it uses less digits than its factorization.

1381586856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428185 (or 4428181 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The square root of 1381586856 is about 37169.7034693579. The cubic root of 1381586856 is about 1113.7628582396.

The spelling of 1381586856 in words is "one billion, three hundred eighty-one million, five hundred eighty-six thousand, eight hundred fifty-six".