8642739 has 16 divisors (see below), whose sum is σ = 13863680. Its totient is φ = 4678560.

The previous prime is 8642723. The next prime is 8642747. The reversal of 8642739 is 9372468.

It is not a de Polignac number, because 8642739 - 2⁴ = 8642723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8642697 and 8642706.

It is not an unprimeable number, because it can be changed into a prime (8642839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10432 + ... + 11229.

It is an arithmetic number, because the mean of its divisors is an integer number (866480).

Almost surely, 2^8642739 is an apocalyptic number.

8642739 is a deficient number, since it is larger than the sum of its proper divisors (5220941).

8642739 is a wasteful number, since it uses less digits than its factorization.

8642739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21690.

The product of its digits is 72576, while the sum is 39.

The square root of 8642739 is about 2939.8535677819. The cubic root of 8642739 is about 205.2187947553.

The spelling of 8642739 in words is "eight million, six hundred forty-two thousand, seven hundred thirty-nine".