428438 has 4 divisors (see below), whose sum is σ = 642660. Its totient is φ = 214218.

The previous prime is 428429. The next prime is 428471. The reversal of 428438 is 834824.

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

It is a self number, because there is not a number n which added to its sum of digits gives 428438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107108 + ... + 107111.

It is an arithmetic number, because the mean of its divisors is an integer number (160665).

2⁴²⁸⁴³⁸ is an apocalyptic number.

428438 is a deficient number, since it is larger than the sum of its proper divisors (214222).

428438 is a wasteful number, since it uses less digits than its factorization.

428438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214221.

The product of its digits is 6144, while the sum is 29.

The square root of 428438 is about 654.5517550202. The cubic root of 428438 is about 75.3869190018.

The spelling of 428438 in words is "four hundred twenty-eight thousand, four hundred thirty-eight".