1020839 has 2 divisors, whose sum is σ = 1020840. Its totient is φ = 1020838.

The previous prime is 1020827. The next prime is 1020841. The reversal of 1020839 is 9380201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020839 - 2⁴ = 1020823 is a prime.

It is a super-2 number, since 2×1020839² = 2084224527842, which contains 22 as substring.

Together with 1020841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023839) 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 as a sum of consecutive naturals, namely, 510419 + 510420.

It is an arithmetic number, because the mean of its divisors is an integer number (510420).

2^1020839 is an apocalyptic number.

1020839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020839 is an equidigital number, since it uses as much as digits as its factorization.

1020839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1020839 is about 1010.3657753507. The cubic root of 1020839 is about 100.6898632761.

The spelling of 1020839 in words is "one million, twenty thousand, eight hundred thirty-nine".