428123 has 4 divisors (see below), whose sum is σ = 437280. Its totient is φ = 418968.

The previous prime is 428093. The next prime is 428137. The reversal of 428123 is 321824.

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 428123 - 2¹² = 424027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428095 and 428104.

It is not an unprimeable number, because it can be changed into a prime (428143) 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, 4508 + ... + 4601.

It is an arithmetic number, because the mean of its divisors is an integer number (109320).

2⁴²⁸¹²³ is an apocalyptic number.

428123 is a deficient number, since it is larger than the sum of its proper divisors (9157).

428123 is an equidigital number, since it uses as much as digits as its factorization.

428123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9156.

The product of its digits is 384, while the sum is 20.

The square root of 428123 is about 654.3110880919. The cubic root of 428123 is about 75.3684389248.

Adding to 428123 its reverse (321824), we get a palindrome (749947).

The spelling of 428123 in words is "four hundred twenty-eight thousand, one hundred twenty-three".