42155418 has 8 divisors (see below), whose sum is σ = 84310848. Its totient is φ = 14051804.

The previous prime is 42155411. The next prime is 42155447. The reversal of 42155418 is 81455124.

42155418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

42155418 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (42155411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3512946 + ... + 3512957.

It is an arithmetic number, because the mean of its divisors is an integer number (10538856).

Almost surely, 2^42155418 is an apocalyptic number.

42155418 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

42155418 is a wasteful number, since it uses less digits than its factorization.

42155418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7025908.

The product of its digits is 6400, while the sum is 30.

The square root of 42155418 is about 6492.7203851698. The cubic root of 42155418 is about 348.0308963188.

The spelling of 42155418 in words is "forty-two million, one hundred fifty-five thousand, four hundred eighteen".