42549918 has 32 divisors (see below), whose sum is σ = 88737792. Its totient is φ = 13586400.

The previous prime is 42549907. The next prime is 42549973. The reversal of 42549918 is 81994524.

It is a self number, because there is not a number n which added to its sum of digits gives 42549918.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18048 + ... + 20268.

It is an arithmetic number, because the mean of its divisors is an integer number (2773056).

Almost surely, 2^42549918 is an apocalyptic number.

42549918 is an abundant number, since it is smaller than the sum of its proper divisors (46187874).

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

42549918 is a wasteful number, since it uses less digits than its factorization.

42549918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2360.

The product of its digits is 103680, while the sum is 42.

The square root of 42549918 is about 6523.0298175005. The cubic root of 42549918 is about 349.1131780178.

The spelling of 42549918 in words is "forty-two million, five hundred forty-nine thousand, nine hundred eighteen".