428543999 has 4 divisors (see below), whose sum is σ = 461508936. Its totient is φ = 395579064.

The previous prime is 428543923. The next prime is 428544019. The reversal of 428543999 is 999345824.

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

It is a cyclic number.

It is not a de Polignac number, because 428543999 - 2²⁴ = 411766783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428543999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428543299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16482449 + ... + 16482474.

It is an arithmetic number, because the mean of its divisors is an integer number (115377234).

Almost surely, 2^428543999 is an apocalyptic number.

428543999 is a deficient number, since it is larger than the sum of its proper divisors (32964937).

428543999 is a wasteful number, since it uses less digits than its factorization.

428543999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32964936.

The product of its digits is 2799360, while the sum is 53.

The square root of 428543999 is about 20701.3042825808. The cubic root of 428543999 is about 753.9313559875.

It can be divided in two parts, 4285 and 43999, that added together give a palindrome (48284).

The spelling of 428543999 in words is "four hundred twenty-eight million, five hundred forty-three thousand, nine hundred ninety-nine".