920839 has 4 divisors (see below), whose sum is σ = 975024. Its totient is φ = 866656.

The previous prime is 920833. The next prime is 920849. The reversal of 920839 is 938029.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938029 = 31 ⋅30259.

It is a cyclic number.

It is not a de Polignac number, because 920839 - 2⁵ = 920807 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 920839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27067 + ... + 27100.

It is an arithmetic number, because the mean of its divisors is an integer number (243756).

2⁹²⁰⁸³⁹ is an apocalyptic number.

920839 is a deficient number, since it is larger than the sum of its proper divisors (54185).

920839 is a wasteful number, since it uses less digits than its factorization.

920839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54184.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 920839 is about 959.6035639784. The cubic root of 920839 is about 97.2884389298.

The spelling of 920839 in words is "nine hundred twenty thousand, eight hundred thirty-nine".