8419729 has 4 divisors (see below), whose sum is σ = 8442676. Its totient is φ = 8396784.

The previous prime is 8419727. The next prime is 8419751. The reversal of 8419729 is 9279148.

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 + 6250000 = 1473^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 8419729 - 2¹ = 8419727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8419691 and 8419700.

It is not an unprimeable number, because it can be changed into a prime (8419727) 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, 10914 + ... + 11659.

It is an arithmetic number, because the mean of its divisors is an integer number (2110669).

Almost surely, 2^8419729 is an apocalyptic number.

It is an amenable number.

8419729 is a deficient number, since it is larger than the sum of its proper divisors (22947).

8419729 is a wasteful number, since it uses less digits than its factorization.

8419729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22946.

The product of its digits is 36288, while the sum is 40.

The square root of 8419729 is about 2901.6769289499. The cubic root of 8419729 is about 203.4382936261.

The spelling of 8419729 in words is "eight million, four hundred nineteen thousand, seven hundred twenty-nine".