428691 has 4 divisors (see below), whose sum is σ = 571592. Its totient is φ = 285792.

The previous prime is 428683. The next prime is 428693. The reversal of 428691 is 196824.

428691 is nontrivially palindromic in base 14.

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

It is not a de Polignac number, because 428691 - 2³ = 428683 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428693) 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, 71446 + ... + 71451.

It is an arithmetic number, because the mean of its divisors is an integer number (142898).

2⁴²⁸⁶⁹¹ is an apocalyptic number.

428691 is a deficient number, since it is larger than the sum of its proper divisors (142901).

428691 is a wasteful number, since it uses less digits than its factorization.

428691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142900.

The product of its digits is 3456, while the sum is 30.

The square root of 428691 is about 654.7449885261. The cubic root of 428691 is about 75.4017551721.

The spelling of 428691 in words is "four hundred twenty-eight thousand, six hundred ninety-one".