7848721 has 4 divisors (see below), whose sum is σ = 7856100. Its totient is φ = 7841344.

The previous prime is 7848719. The next prime is 7848733. The reversal of 7848721 is 1278487.

7848721 = 44⁴ + 45⁴.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1278487 = 7 ⋅182641.

It can be written as a sum of positive squares in 2 ways, for example, as 4100625 + 3748096 = 2025^2 + 1936^2 .

It is a cyclic number.

It is not a de Polignac number, because 7848721 - 2¹ = 7848719 is a prime.

It is an Ulam number.

It is a Duffinian number.

7848721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7848761) 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, 1756 + ... + 4333.

It is an arithmetic number, because the mean of its divisors is an integer number (1964025).

Almost surely, 2^7848721 is an apocalyptic number.

It is an amenable number.

7848721 is a deficient number, since it is larger than the sum of its proper divisors (7379).

7848721 is a wasteful number, since it uses less digits than its factorization.

7848721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7378.

The product of its digits is 25088, while the sum is 37.

The square root of 7848721 is about 2801.5568885889. The cubic root of 7848721 is about 198.7313108226.

The spelling of 7848721 in words is "seven million, eight hundred forty-eight thousand, seven hundred twenty-one".