7904005 has 4 divisors (see below), whose sum is σ = 9484812. Its totient is φ = 6323200.

The previous prime is 7903999. The next prime is 7904009. The reversal of 7904005 is 5004097.

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 5924356 + 1979649 = 2434^2 + 1407^2 .

It is not a de Polignac number, because 7904005 - 2⁷ = 7903877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7904009) by changing a digit.

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, 790396 + ... + 790405.

It is an arithmetic number, because the mean of its divisors is an integer number (2371203).

Almost surely, 2^7904005 is an apocalyptic number.

It is an amenable number.

7904005 is a deficient number, since it is larger than the sum of its proper divisors (1580807).

7904005 is a wasteful number, since it uses less digits than its factorization.

7904005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580806.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 7904005 is about 2811.4062317637. The cubic root of 7904005 is about 199.1968204978.

The spelling of 7904005 in words is "seven million, nine hundred four thousand, five".