42945890 has 32 divisors (see below), whose sum is σ = 87635520. Its totient is φ = 15021504.

The previous prime is 42945883. The next prime is 42945913. The reversal of 42945890 is 9854924.

42945890 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 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 15 ways as a sum of consecutive naturals, for example, 6224 + ... + 11163.

It is an arithmetic number, because the mean of its divisors is an integer number (2738610).

Almost surely, 2^42945890 is an apocalyptic number.

42945890 is an abundant number, since it is smaller than the sum of its proper divisors (44689630).

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

42945890 is a wasteful number, since it uses less digits than its factorization.

42945890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17426.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 42945890 is about 6553.3113767011. The cubic root of 42945890 is about 350.1927917435.

The spelling of 42945890 in words is "forty-two million, nine hundred forty-five thousand, eight hundred ninety".