8426729 has 4 divisors (see below), whose sum is σ = 8471040. Its totient is φ = 8382420.

The previous prime is 8426701. The next prime is 8426731. The reversal of 8426729 is 9276248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8426729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8426692 and 8426701.

It is not an unprimeable number, because it can be changed into a prime (8423729) 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, 21869 + ... + 22250.

It is an arithmetic number, because the mean of its divisors is an integer number (2117760).

Almost surely, 2^8426729 is an apocalyptic number.

It is an amenable number.

8426729 is a deficient number, since it is larger than the sum of its proper divisors (44311).

8426729 is a wasteful number, since it uses less digits than its factorization.

8426729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44310.

The product of its digits is 48384, while the sum is 38.

The square root of 8426729 is about 2902.8828774169. The cubic root of 8426729 is about 203.4946562315.

The spelling of 8426729 in words is "eight million, four hundred twenty-six thousand, seven hundred twenty-nine".