90820839 has 4 divisors (see below), whose sum is σ = 121094456. Its totient is φ = 60547224.

The previous prime is 90820831. The next prime is 90820843. The reversal of 90820839 is 93802809.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90820839 - 2³ = 90820831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90820797 and 90820806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90820831) 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, 15136804 + ... + 15136809.

It is an arithmetic number, because the mean of its divisors is an integer number (30273614).

Almost surely, 2^90820839 is an apocalyptic number.

90820839 is a deficient number, since it is larger than the sum of its proper divisors (30273617).

90820839 is a wasteful number, since it uses less digits than its factorization.

90820839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30273616.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 90820839 is about 9529.9967995797. The cubic root of 90820839 is about 449.4987653615.

The spelling of 90820839 in words is "ninety million, eight hundred twenty thousand, eight hundred thirty-nine".