7993861 has 4 divisors (see below), whose sum is σ = 8000800. Its totient is φ = 7986924.

The previous prime is 7993849. The next prime is 7993871. The reversal of 7993861 is 1683997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1683997 = 7 ⋅240571.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7993861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7993801) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1281 + ... + 4198.

It is an arithmetic number, because the mean of its divisors is an integer number (2000200).

Almost surely, 2^7993861 is an apocalyptic number.

It is an amenable number.

7993861 is a deficient number, since it is larger than the sum of its proper divisors (6939).

7993861 is a wasteful number, since it uses less digits than its factorization.

7993861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938.

The product of its digits is 81648, while the sum is 43.

The square root of 7993861 is about 2827.3416843388. The cubic root of 7993861 is about 199.9488285752.

The spelling of 7993861 in words is "seven million, nine hundred ninety-three thousand, eight hundred sixty-one".