7997986 has 4 divisors (see below), whose sum is σ = 11996982. Its totient is φ = 3998992.

The previous prime is 7997971. The next prime is 7997989. The reversal of 7997986 is 6897997.

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., 7667361 + 330625 = 2769^2 + 575^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7997989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999495 + ... + 1999498.

Almost surely, 2^7997986 is an apocalyptic number.

7997986 is a deficient number, since it is larger than the sum of its proper divisors (3998996).

7997986 is a wasteful number, since it uses less digits than its factorization.

7997986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998995.

The product of its digits is 1714608, while the sum is 55.

The square root of 7997986 is about 2828.0710740715. The cubic root of 7997986 is about 199.9832152581.

The spelling of 7997986 in words is "seven million, nine hundred ninety-seven thousand, nine hundred eighty-six".