428989 has 8 divisors (see below), whose sum is σ = 476640. Its totient is φ = 382800.

The previous prime is 428977. The next prime is 429007. The reversal of 428989 is 989824.

It is a happy number.

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

It is not a de Polignac number, because 428989 - 2⁵ = 428957 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428489) 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, 319 + ... + 979.

It is an arithmetic number, because the mean of its divisors is an integer number (59580).

2⁴²⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

428989 is a deficient number, since it is larger than the sum of its proper divisors (47651).

428989 is a wasteful number, since it uses less digits than its factorization.

428989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731.

The product of its digits is 41472, while the sum is 40.

The square root of 428989 is about 654.9725185075. The cubic root of 428989 is about 75.4192227020.

The spelling of 428989 in words is "four hundred twenty-eight thousand, nine hundred eighty-nine".