8729405 has 8 divisors (see below), whose sum is σ = 10647384. Its totient is φ = 6868800.

The previous prime is 8729401. The next prime is 8729411. The reversal of 8729405 is 5049278.

It is a happy number.

8729405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 900601 + 7828804 = 949^2 + 2798^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8729405 - 2² = 8729401 is a prime.

It is a d-powerful number, because it can be written as 8³ + 7 + 2²³ + 9 + 4⁹ + 0 + 5⁷ .

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8729401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14006 + ... + 14615.

It is an arithmetic number, because the mean of its divisors is an integer number (1330923).

Almost surely, 2^8729405 is an apocalyptic number.

It is an amenable number.

8729405 is a deficient number, since it is larger than the sum of its proper divisors (1917979).

8729405 is a wasteful number, since it uses less digits than its factorization.

8729405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28687.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 8729405 is about 2954.5566503284. The cubic root of 8729405 is about 205.9024658462.

It can be divided in two parts, 87 and 29405, that added together give a palindrome (29492).

The spelling of 8729405 in words is "eight million, seven hundred twenty-nine thousand, four hundred five".