42890 has 8 divisors (see below), whose sum is σ = 77220. Its totient is φ = 17152.

The previous prime is 42863. The next prime is 42899. The reversal of 42890 is 9824.

42890 = T₆₈ + T₆₉ + ... + T₈₂.

42890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 41209 + 1681 = 203^2 + 41^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (42899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135 + ... + 2154.

2⁴²⁸⁹⁰ is an apocalyptic number.

42890 is a deficient number, since it is larger than the sum of its proper divisors (34330).

42890 is a wasteful number, since it uses less digits than its factorization.

42890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 42890 is about 207.0990101377. The cubic root of 42890 is about 35.0040811568.

The spelling of 42890 in words is "forty-two thousand, eight hundred ninety".