8439745 has 4 divisors (see below), whose sum is σ = 10127700. Its totient is φ = 6751792.

The previous prime is 8439721. The next prime is 8439751. The reversal of 8439745 is 5479348.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2169729 + 6270016 = 1473^2 + 2504^2 .

It is a cyclic number.

It is not a de Polignac number, because 8439745 - 2⁵ = 8439713 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 8439698 and 8439707.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843970 + ... + 843979.

It is an arithmetic number, because the mean of its divisors is an integer number (2531925).

Almost surely, 2^8439745 is an apocalyptic number.

It is an amenable number.

8439745 is a deficient number, since it is larger than the sum of its proper divisors (1687955).

8439745 is a wasteful number, since it uses less digits than its factorization.

8439745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687954.

The product of its digits is 120960, while the sum is 40.

The square root of 8439745 is about 2905.1239216254. The cubic root of 8439745 is about 203.5993755473.

The spelling of 8439745 in words is "eight million, four hundred thirty-nine thousand, seven hundred forty-five".