7984905 has 8 divisors (see below), whose sum is σ = 12775872. Its totient is φ = 4258608.

The previous prime is 7984903. The next prime is 7984931. The reversal of 7984905 is 5094897.

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

It is not a de Polignac number, because 7984905 - 2¹ = 7984903 is a prime.

7984905 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7984901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266149 + ... + 266178.

It is an arithmetic number, because the mean of its divisors is an integer number (1596984).

Almost surely, 2^7984905 is an apocalyptic number.

It is an amenable number.

7984905 is a deficient number, since it is larger than the sum of its proper divisors (4790967).

7984905 is a wasteful number, since it uses less digits than its factorization.

7984905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532335.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 7984905 is about 2825.7574205866. The cubic root of 7984905 is about 199.8741291326.

The spelling of 7984905 in words is "seven million, nine hundred eighty-four thousand, nine hundred five".