7986643 has 4 divisors (see below), whose sum is σ = 9127600. Its totient is φ = 6845688.

The previous prime is 7986637. The next prime is 7986647. The reversal of 7986643 is 3466897.

It is a happy number.

7986643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 7986643 - 2⁵ = 7986611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7986643.

It is not an unprimeable number, because it can be changed into a prime (7986647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570468 + ... + 570481.

It is an arithmetic number, because the mean of its divisors is an integer number (2281900).

Almost surely, 2^7986643 is an apocalyptic number.

7986643 is a deficient number, since it is larger than the sum of its proper divisors (1140957).

7986643 is a wasteful number, since it uses less digits than its factorization.

7986643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140956.

The product of its digits is 217728, while the sum is 43.

The square root of 7986643 is about 2826.0649320212. The cubic root of 7986643 is about 199.8886296614. Note that the first 3 decimals are identical.

The spelling of 7986643 in words is "seven million, nine hundred eighty-six thousand, six hundred forty-three".