428979 has 4 divisors (see below), whose sum is σ = 571976. Its totient is φ = 285984.

The previous prime is 428977. The next prime is 429007. The reversal of 428979 is 979824.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 428979 - 2¹ = 428977 is a prime.

It is a D-number.

It is a Duffinian number.

428979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (428977) 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 3 ways as a sum of consecutive naturals, for example, 71494 + ... + 71499.

It is an arithmetic number, because the mean of its divisors is an integer number (142994).

2⁴²⁸⁹⁷⁹ is an apocalyptic number.

428979 is a deficient number, since it is larger than the sum of its proper divisors (142997).

428979 is a wasteful number, since it uses less digits than its factorization.

428979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142996.

The product of its digits is 36288, while the sum is 39.

The square root of 428979 is about 654.9648845549. The cubic root of 428979 is about 75.4186366745.

The spelling of 428979 in words is "four hundred twenty-eight thousand, nine hundred seventy-nine".