7873861 has 4 divisors (see below), whose sum is σ = 7879500. Its totient is φ = 7868224.

The previous prime is 7873849. The next prime is 7873871. The reversal of 7873861 is 1683787.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 616225 = 2694^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 7873861 - 2¹¹ = 7871813 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7873841) 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, 1005 + ... + 4093.

It is an arithmetic number, because the mean of its divisors is an integer number (1969875).

Almost surely, 2^7873861 is an apocalyptic number.

It is an amenable number.

7873861 is a deficient number, since it is larger than the sum of its proper divisors (5639).

7873861 is a wasteful number, since it uses less digits than its factorization.

7873861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5638.

The product of its digits is 56448, while the sum is 40.

The square root of 7873861 is about 2806.0400923722. The cubic root of 7873861 is about 198.9432680886.

The spelling of 7873861 in words is "seven million, eight hundred seventy-three thousand, eight hundred sixty-one".