1020857 has 4 divisors (see below), whose sum is σ = 1024896. Its totient is φ = 1016820.

The previous prime is 1020853. The next prime is 1020881. The reversal of 1020857 is 7580201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7580201 = 107 ⋅70843.

It is a cyclic number.

It is not a de Polignac number, because 1020857 - 2² = 1020853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020853) 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 3 ways as a sum of consecutive naturals, for example, 1613 + ... + 2154.

It is an arithmetic number, because the mean of its divisors is an integer number (256224).

2^1020857 is an apocalyptic number.

It is an amenable number.

1020857 is a deficient number, since it is larger than the sum of its proper divisors (4039).

1020857 is an equidigital number, since it uses as much as digits as its factorization.

1020857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1020857 is about 1010.3746829766. The cubic root of 1020857 is about 100.6904550792.

The spelling of 1020857 in words is "one million, twenty thousand, eight hundred fifty-seven".