42518917 has 6 divisors (see below), whose sum is σ = 49460838. Its totient is φ = 36444744.

The previous prime is 42518869. The next prime is 42518933. The reversal of 42518917 is 71981524.

It can be written as a sum of positive squares in only one way, i.e., 23804641 + 18714276 = 4879^2 + 4326^2 .

It is not a de Polignac number, because 42518917 - 2¹⁵ = 42486149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42518317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433818 + ... + 433915.

It is an arithmetic number, because the mean of its divisors is an integer number (8243473).

Almost surely, 2^42518917 is an apocalyptic number.

It is an amenable number.

42518917 is a deficient number, since it is larger than the sum of its proper divisors (6941921).

42518917 is an equidigital number, since it uses as much as digits as its factorization.

42518917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867747 (or 867740 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 42518917 is about 6520.6531114605. The cubic root of 42518917 is about 349.0283718447.

The spelling of 42518917 in words is "forty-two million, five hundred eighteen thousand, nine hundred seventeen".