42428389 has 4 divisors (see below), whose sum is σ = 42825024. Its totient is φ = 42031756.

The previous prime is 42428369. The next prime is 42428417. The reversal of 42428389 is 98382424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42428389 - 2⁹ = 42427877 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42428339) 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, 198157 + ... + 198370.

It is an arithmetic number, because the mean of its divisors is an integer number (10706256).

Almost surely, 2^42428389 is an apocalyptic number.

It is an amenable number.

42428389 is a deficient number, since it is larger than the sum of its proper divisors (396635).

42428389 is a wasteful number, since it uses less digits than its factorization.

42428389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396634.

The product of its digits is 110592, while the sum is 40.

The square root of 42428389 is about 6513.7077766814. The cubic root of 42428389 is about 348.7804877361.

The spelling of 42428389 in words is "forty-two million, four hundred twenty-eight thousand, three hundred eighty-nine".