428623 has 4 divisors (see below), whose sum is σ = 461608. Its totient is φ = 395640.

The previous prime is 428579. The next prime is 428629. The reversal of 428623 is 326824.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428623 is a prime.

It is a super-2 number, since 2×428623² = 367435352258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428629) 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, 16473 + ... + 16498.

It is an arithmetic number, because the mean of its divisors is an integer number (115402).

2⁴²⁸⁶²³ is an apocalyptic number.

428623 is a deficient number, since it is larger than the sum of its proper divisors (32985).

428623 is a wasteful number, since it uses less digits than its factorization.

428623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32984.

The product of its digits is 2304, while the sum is 25.

The square root of 428623 is about 654.6930578523. The cubic root of 428623 is about 75.3977681586.

The spelling of 428623 in words is "four hundred twenty-eight thousand, six hundred twenty-three".