1020858 has 16 divisors (see below), whose sum is σ = 2112480. Its totient is φ = 328496.

The previous prime is 1020853. The next prime is 1020881. The reversal of 1020858 is 8580201.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 2760 + ... + 3107.

It is an arithmetic number, because the mean of its divisors is an integer number (132030).

2^1020858 is an apocalyptic number.

1020858 is an abundant number, since it is smaller than the sum of its proper divisors (1091622).

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

1020858 is a wasteful number, since it uses less digits than its factorization.

1020858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5901.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 1020858 is about 1010.3751778424. The cubic root of 1020858 is about 100.6904879569.

The spelling of 1020858 in words is "one million, twenty thousand, eight hundred fifty-eight".