42115865 has 24 divisors (see below), whose sum is σ = 56434560. Its totient is φ = 30143520.

The previous prime is 42115861. The next prime is 42115883. The reversal of 42115865 is 56851124.

It is not a de Polignac number, because 42115865 - 2² = 42115861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42115861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40016 + ... + 41054.

It is an arithmetic number, because the mean of its divisors is an integer number (2351440).

Almost surely, 2^42115865 is an apocalyptic number.

It is an amenable number.

42115865 is a deficient number, since it is larger than the sum of its proper divisors (14318695).

42115865 is a wasteful number, since it uses less digits than its factorization.

42115865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1122 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The square root of 42115865 is about 6489.6737206118. The cubic root of 42115865 is about 347.9220137265.

Adding to 42115865 its reverse (56851124), we get a palindrome (98966989).

The spelling of 42115865 in words is "forty-two million, one hundred fifteen thousand, eight hundred sixty-five".