7984861 has 4 divisors (see below), whose sum is σ = 8005372. Its totient is φ = 7964352.

The previous prime is 7984829. The next prime is 7984891. The reversal of 7984861 is 1684897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1684897 = 367 ⋅4591.

It can be written as a sum of positive squares in 2 ways, for example, as 2579236 + 5405625 = 1606^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 7984861 - 2⁵ = 7984829 is a prime.

It is a Duffinian number.

7984861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7984891) 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, 9660 + ... + 10453.

It is an arithmetic number, because the mean of its divisors is an integer number (2001343).

Almost surely, 2^7984861 is an apocalyptic number.

It is an amenable number.

7984861 is a deficient number, since it is larger than the sum of its proper divisors (20511).

7984861 is a wasteful number, since it uses less digits than its factorization.

7984861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20510.

The product of its digits is 96768, while the sum is 43.

The square root of 7984861 is about 2825.7496350526. The cubic root of 7984861 is about 199.8737620033.

The spelling of 7984861 in words is "seven million, nine hundred eighty-four thousand, eight hundred sixty-one".