42338509 has 4 divisors (see below), whose sum is σ = 42734304. Its totient is φ = 41942716.

The previous prime is 42338503. The next prime is 42338533. The reversal of 42338509 is 90583324.

It is a happy number.

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 not a de Polignac number, because 42338509 - 2¹¹ = 42336461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42338503) 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, 197737 + ... + 197950.

It is an arithmetic number, because the mean of its divisors is an integer number (10683576).

Almost surely, 2^42338509 is an apocalyptic number.

It is an amenable number.

42338509 is a deficient number, since it is larger than the sum of its proper divisors (395795).

42338509 is a wasteful number, since it uses less digits than its factorization.

42338509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395794.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 42338509 is about 6506.8048226453. The cubic root of 42338509 is about 348.5340289134.

The spelling of 42338509 in words is "forty-two million, three hundred thirty-eight thousand, five hundred nine".