7904409 has 8 divisors (see below), whose sum is σ = 10620192. Its totient is φ = 5229120.

The previous prime is 7904381. The next prime is 7904417. The reversal of 7904409 is 9044097.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7904409 - 2⁹ = 7903897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7904409.

It is not an unprimeable number, because it can be changed into a prime (7904419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9664 + ... + 10449.

It is an arithmetic number, because the mean of its divisors is an integer number (1327524).

Almost surely, 2^7904409 is an apocalyptic number.

It is an amenable number.

7904409 is a deficient number, since it is larger than the sum of its proper divisors (2715783).

7904409 is a wasteful number, since it uses less digits than its factorization.

7904409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20247.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 7904409 is about 2811.4780810101. The cubic root of 7904409 is about 199.2002143108.

The spelling of 7904409 in words is "seven million, nine hundred four thousand, four hundred nine".