8729845 has 4 divisors (see below), whose sum is σ = 10475820. Its totient is φ = 6983872.

The previous prime is 8729839. The next prime is 8729849. The reversal of 8729845 is 5489278.

8729845 is digitally balanced in base 2, 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, and also an emirpimes, since its reverse is a distinct semiprime: 5489278 = 2 ⋅2744639.

It can be written as a sum of positive squares in 2 ways, for example, as 5202961 + 3526884 = 2281^2 + 1878^2 .

It is a cyclic number.

It is not a de Polignac number, because 8729845 - 2³ = 8729837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8729849) 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, 872980 + ... + 872989.

It is an arithmetic number, because the mean of its divisors is an integer number (2618955).

Almost surely, 2^8729845 is an apocalyptic number.

It is an amenable number.

8729845 is a deficient number, since it is larger than the sum of its proper divisors (1745975).

8729845 is a wasteful number, since it uses less digits than its factorization.

8729845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745974.

The product of its digits is 161280, while the sum is 43.

The square root of 8729845 is about 2954.6311106465. The cubic root of 8729845 is about 205.9059252482.

The spelling of 8729845 in words is "eight million, seven hundred twenty-nine thousand, eight hundred forty-five".