7999986 has 8 divisors (see below), whose sum is σ = 15999984. Its totient is φ = 2666660.

The previous prime is 7999963. The next prime is 7999993. The reversal of 7999986 is 6899997.

7999986 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

7999986 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666660 + ... + 666671.

It is an arithmetic number, because the mean of its divisors is an integer number (1999998).

Almost surely, 2^7999986 is an apocalyptic number.

7999986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7999986 is a wasteful number, since it uses less digits than its factorization.

7999986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333336.

The product of its digits is 2204496, while the sum is 57.

The square root of 7999986 is about 2828.4246498714. The cubic root of 7999986 is about 199.9998833333. Note that the first 3 decimals are identical.

The spelling of 7999986 in words is "seven million, nine hundred ninety-nine thousand, nine hundred eighty-six".