42840115 has 4 divisors (see below), whose sum is σ = 51408144. Its totient is φ = 34272088.

The previous prime is 42840113. The next prime is 42840131. The reversal of 42840115 is 51104824.

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

It is a cyclic number.

It is not a de Polignac number, because 42840115 - 2¹ = 42840113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42840115.

It is not an unprimeable number, because it can be changed into a prime (42840113) 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, 4284007 + ... + 4284016.

It is an arithmetic number, because the mean of its divisors is an integer number (12852036).

Almost surely, 2^42840115 is an apocalyptic number.

42840115 is a deficient number, since it is larger than the sum of its proper divisors (8568029).

42840115 is an equidigital number, since it uses as much as digits as its factorization.

42840115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568028.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 42840115 is about 6545.2360538028. The cubic root of 42840115 is about 349.9050490732.

Adding to 42840115 its reverse (51104824), we get a palindrome (93944939).

The spelling of 42840115 in words is "forty-two million, eight hundred forty thousand, one hundred fifteen".