42185904 has 20 divisors (see below), whose sum is σ = 108980376. Its totient is φ = 14061952.

The previous prime is 42185903. The next prime is 42185917. The reversal of 42185904 is 40958124.

It is not an unprimeable number, because it can be changed into a prime (42185903) 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 3 ways as a sum of consecutive naturals, for example, 439389 + ... + 439484.

Almost surely, 2^42185904 is an apocalyptic number.

It is an amenable number.

42185904 is an abundant number, since it is smaller than the sum of its proper divisors (66794472).

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

42185904 is a wasteful number, since it uses less digits than its factorization.

42185904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878884 (or 878878 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 42185904 is about 6495.0676670840. The cubic root of 42185904 is about 348.1147725540.

The spelling of 42185904 in words is "forty-two million, one hundred eighty-five thousand, nine hundred four".