1021382856 has 48 divisors (see below), whose sum is σ = 2979036060. Its totient is φ = 314271360.

The previous prime is 1021382851. The next prime is 1021382893. The reversal of 1021382856 is 6582831201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1001722500 + 19660356 = 31650^2 + 4434^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1021382856.

It is not an unprimeable number, because it can be changed into a prime (1021382851) 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, 544675 + ... + 546546.

Almost surely, 2^1021382856 is an apocalyptic number.

It is an amenable number.

1021382856 is an abundant number, since it is smaller than the sum of its proper divisors (1957653204).

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

1021382856 is a wasteful number, since it uses less digits than its factorization.

1021382856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091246 (or 1091239 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1021382856 is about 31959.0809630064. The cubic root of 1021382856 is about 1007.0774107551.

The spelling of 1021382856 in words is "one billion, twenty-one million, three hundred eighty-two thousand, eight hundred fifty-six".