42219918 has 36 divisors (see below), whose sum is σ = 99061560. Its totient is φ = 12989808.

The previous prime is 42219917. The next prime is 42219949. The reversal of 42219918 is 81991224.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42219913) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 3898 + ... + 9981.

It is an arithmetic number, because the mean of its divisors is an integer number (2751710).

Almost surely, 2^42219918 is an apocalyptic number.

42219918 is an abundant number, since it is smaller than the sum of its proper divisors (56841642).

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

42219918 is a wasteful number, since it uses less digits than its factorization.

42219918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13913 (or 13897 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 42219918 is about 6497.6855879613. The cubic root of 42219918 is about 348.2083077069.

The spelling of 42219918 in words is "forty-two million, two hundred nineteen thousand, nine hundred eighteen".