7991506 has 4 divisors (see below), whose sum is σ = 11987262. Its totient is φ = 3995752.

The previous prime is 7991483. The next prime is 7991531. The reversal of 7991506 is 6051997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4347225 + 3644281 = 2085^2 + 1909^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1997875 + ... + 1997878.

Almost surely, 2^7991506 is an apocalyptic number.

7991506 is a deficient number, since it is larger than the sum of its proper divisors (3995756).

7991506 is a wasteful number, since it uses less digits than its factorization.

7991506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3995755.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 7991506 is about 2826.9251847193. The cubic root of 7991506 is about 199.9291916005.

The spelling of 7991506 in words is "seven million, nine hundred ninety-one thousand, five hundred six".