42428 has 6 divisors (see below), whose sum is σ = 74256. Its totient is φ = 21212.

The previous prime is 42409. The next prime is 42433. The reversal of 42428 is 82424.

It is a plaindrome in base 14.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

42428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300 + ... + 5307.

It is an arithmetic number, because the mean of its divisors is an integer number (12376).

2⁴²⁴²⁸ is an apocalyptic number.

It is an amenable number.

42428 is a deficient number, since it is larger than the sum of its proper divisors (31828).

42428 is a wasteful number, since it uses less digits than its factorization.

42428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611 (or 10609 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 42428 is about 205.9805816090. The cubic root of 42428 is about 34.8779421814.

The spelling of 42428 in words is "forty-two thousand, four hundred twenty-eight".