42428409 has 8 divisors (see below), whose sum is σ = 56630112. Its totient is φ = 28256160.

The previous prime is 42428369. The next prime is 42428417. The reversal of 42428409 is 90482424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42428409 - 2¹¹ = 42426361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42428409.

It is not an unprimeable number, because it can be changed into a prime (42428509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3747 + ... + 9944.

It is an arithmetic number, because the mean of its divisors is an integer number (7078764).

Almost surely, 2^42428409 is an apocalyptic number.

It is an amenable number.

42428409 is a deficient number, since it is larger than the sum of its proper divisors (14201703).

42428409 is a wasteful number, since it uses less digits than its factorization.

42428409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14727.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 42428409 is about 6513.7093119052. The cubic root of 42428409 is about 348.7805425391.

The spelling of 42428409 in words is "forty-two million, four hundred twenty-eight thousand, four hundred nine".