7920005 has 4 divisors (see below), whose sum is σ = 9504012. Its totient is φ = 6336000.

The previous prime is 7919993. The next prime is 7920019. The reversal of 7920005 is 5000297.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5000297 = 1567 ⋅3191.

It can be written as a sum of positive squares in 2 ways, for example, as 3786916 + 4133089 = 1946^2 + 2033^2 .

It is not a de Polignac number, because 7920005 - 2¹⁸ = 7657861 is a prime.

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, 791996 + ... + 792005.

It is an arithmetic number, because the mean of its divisors is an integer number (2376003).

Almost surely, 2^7920005 is an apocalyptic number.

It is an amenable number.

7920005 is a deficient number, since it is larger than the sum of its proper divisors (1584007).

7920005 is a wasteful number, since it uses less digits than its factorization.

7920005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584006.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 7920005 is about 2814.2503442302. The cubic root of 7920005 is about 199.3311406293.

The spelling of 7920005 in words is "seven million, nine hundred twenty thousand, five".