42187890 has 64 divisors (see below), whose sum is σ = 104186880. Its totient is φ = 10929600.

The previous prime is 42187877. The next prime is 42187907. The reversal of 42187890 is 9878124.

42187890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 279315 + ... + 279465.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^42187890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42187890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52093440).

42187890 is an abundant number, since it is smaller than the sum of its proper divisors (61998990).

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

42187890 is a wasteful number, since it uses less digits than its factorization.

42187890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 42187890 is about 6495.2205505279. The cubic root of 42187890 is about 348.1202352404.

The spelling of 42187890 in words is "forty-two million, one hundred eighty-seven thousand, eight hundred ninety".