428091 has 4 divisors (see below), whose sum is σ = 570792. Its totient is φ = 285392.

The previous prime is 428083. The next prime is 428093. The reversal of 428091 is 190824.

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 428091 - 2³ = 428083 is a prime.

It is a D-number.

428091 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428091.

It is not an unprimeable number, because it can be changed into a prime (428093) 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, 71346 + ... + 71351.

It is an arithmetic number, because the mean of its divisors is an integer number (142698).

2⁴²⁸⁰⁹¹ is an apocalyptic number.

428091 is a deficient number, since it is larger than the sum of its proper divisors (142701).

428091 is a wasteful number, since it uses less digits than its factorization.

428091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142700.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 428091 is about 654.2866344348. The cubic root of 428091 is about 75.3665610765.

It can be divided in two parts, 4280 and 91, that added together give a triangular number (4371 = T₉₃).

The spelling of 428091 in words is "four hundred twenty-eight thousand, ninety-one".