7890005 has 4 divisors (see below), whose sum is σ = 9468012. Its totient is φ = 6312000.

The previous prime is 7889977. The next prime is 7890013. The reversal of 7890005 is 5000987.

It is a happy number.

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 5193841 + 2696164 = 2279^2 + 1642^2 .

It is not a de Polignac number, because 7890005 - 2¹⁰ = 7888981 is a prime.

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 7890005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788996 + ... + 789005.

It is an arithmetic number, because the mean of its divisors is an integer number (2367003).

Almost surely, 2^7890005 is an apocalyptic number.

It is an amenable number.

7890005 is a deficient number, since it is larger than the sum of its proper divisors (1578007).

7890005 is a wasteful number, since it uses less digits than its factorization.

7890005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578006.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 7890005 is about 2808.9152710611. The cubic root of 7890005 is about 199.0791416063.

The spelling of 7890005 in words is "seven million, eight hundred ninety thousand, five".