42115518 has 32 divisors (see below), whose sum is σ = 93803520. Its totient is φ = 14006520.

The previous prime is 42115517. The next prime is 42115523. The reversal of 42115518 is 81551124.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 42115491 and 42115500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42115517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42003 + ... + 42993.

It is an arithmetic number, because the mean of its divisors is an integer number (2931360).

Almost surely, 2^42115518 is an apocalyptic number.

42115518 is an abundant number, since it is smaller than the sum of its proper divisors (51688002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42115518 is a wasteful number, since it uses less digits than its factorization.

42115518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1783 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 42115518 is about 6489.6469857767. The cubic root of 42115518 is about 347.9210581937.

The spelling of 42115518 in words is "forty-two million, one hundred fifteen thousand, five hundred eighteen".