7991975 has 6 divisors (see below), whose sum is σ = 9910080. Its totient is φ = 6393560.

The previous prime is 7991957. The next prime is 7991981. The reversal of 7991975 is 5791997.

It is a happy number.

It is not a de Polignac number, because 7991975 - 2¹⁰ = 7990951 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159815 + ... + 159864.

It is an arithmetic number, because the mean of its divisors is an integer number (1651680).

Almost surely, 2^7991975 is an apocalyptic number.

7991975 is a deficient number, since it is larger than the sum of its proper divisors (1918105).

7991975 is a wasteful number, since it uses less digits than its factorization.

7991975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319689 (or 319684 counting only the distinct ones).

The product of its digits is 178605, while the sum is 47.

The square root of 7991975 is about 2827.0081358213. The cubic root of 7991975 is about 199.9331026262.

The spelling of 7991975 in words is "seven million, nine hundred ninety-one thousand, nine hundred seventy-five".