428729 has 8 divisors (see below), whose sum is σ = 497280. Its totient is φ = 362016.

The previous prime is 428693. The next prime is 428731. The reversal of 428729 is 927824.

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

It is a cyclic number.

It is not a de Polignac number, because 428729 - 2⁸ = 428473 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 428695 and 428704.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428729.

It is not an unprimeable number, because it can be changed into a prime (428759) 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, 92 + ... + 930.

It is an arithmetic number, because the mean of its divisors is an integer number (62160).

2⁴²⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

428729 is a deficient number, since it is larger than the sum of its proper divisors (68551).

428729 is an equidigital number, since it uses as much as digits as its factorization.

428729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919.

The product of its digits is 8064, while the sum is 32.

The square root of 428729 is about 654.7740068146. The cubic root of 428729 is about 75.4039830255.

The spelling of 428729 in words is "four hundred twenty-eight thousand, seven hundred twenty-nine".