1021382857 has 8 divisors (see below), whose sum is σ = 1141412832. Its totient is φ = 905882400.

The previous prime is 1021382851. The next prime is 1021382893. The reversal of 1021382857 is 7582831201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021382857 - 2³ = 1021382849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021382851) 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, 1131903 + ... + 1132804.

It is an arithmetic number, because the mean of its divisors is an integer number (142676604).

Almost surely, 2^1021382857 is an apocalyptic number.

It is an amenable number.

1021382857 is a deficient number, since it is larger than the sum of its proper divisors (120029975).

1021382857 is a wasteful number, since it uses less digits than its factorization.

1021382857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264759.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1021382857 is about 31959.0809786514. The cubic root of 1021382857 is about 1007.0774110838.

The spelling of 1021382857 in words is "one billion, twenty-one million, three hundred eighty-two thousand, eight hundred fifty-seven".