7920085 has 4 divisors (see below), whose sum is σ = 9504108. Its totient is φ = 6336064.

The previous prime is 7920071. The next prime is 7920091. The reversal of 7920085 is 5800297.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5276209 + 2643876 = 2297^2 + 1626^2 .

It is a cyclic number.

It is not a de Polignac number, because 7920085 - 2⁵ = 7920053 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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792004 + ... + 792013.

It is an arithmetic number, because the mean of its divisors is an integer number (2376027).

Almost surely, 2^7920085 is an apocalyptic number.

It is an amenable number.

7920085 is a deficient number, since it is larger than the sum of its proper divisors (1584023).

7920085 is a wasteful number, since it uses less digits than its factorization.

7920085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584022.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 7920085 is about 2814.2645575709. The cubic root of 7920085 is about 199.3318117752.

It can be divided in two parts, 79 and 20085, that added together give a square (20164 = 142²).

The spelling of 7920085 in words is "seven million, nine hundred twenty thousand, eighty-five".