42187878 has 20 divisors (see below), whose sum is σ = 94532460. Its totient is φ = 14062572.

The previous prime is 42187877. The next prime is 42187907. The reversal of 42187878 is 87878124.

42187878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42187877) 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 9 ways as a sum of consecutive naturals, for example, 130048 + ... + 130371.

It is an arithmetic number, because the mean of its divisors is an integer number (4726623).

Almost surely, 2^42187878 is an apocalyptic number.

42187878 is an abundant number, since it is smaller than the sum of its proper divisors (52344582).

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

42187878 is a wasteful number, since it uses less digits than its factorization.

42187878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260433 (or 260424 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 42187878 is about 6495.2196267717. The cubic root of 42187878 is about 348.1202022338.

The spelling of 42187878 in words is "forty-two million, one hundred eighty-seven thousand, eight hundred seventy-eight".