428587189 has 4 divisors (see below), whose sum is σ = 429267040. Its totient is φ = 427907340.

The previous prime is 428587163. The next prime is 428587207. The reversal of 428587189 is 981785824.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428587189 - 2⁵ = 428587157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428581189) 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, 338979 + ... + 340240.

It is an arithmetic number, because the mean of its divisors is an integer number (107316760).

Almost surely, 2^428587189 is an apocalyptic number.

It is an amenable number.

428587189 is a deficient number, since it is larger than the sum of its proper divisors (679851).

428587189 is an equidigital number, since it uses as much as digits as its factorization.

428587189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679850.

The product of its digits is 1290240, while the sum is 52.

The square root of 428587189 is about 20702.3474272847. The cubic root of 428587189 is about 753.9566829874.

The spelling of 428587189 in words is "four hundred twenty-eight million, five hundred eighty-seven thousand, one hundred eighty-nine".