42990 has 16 divisors (see below), whose sum is σ = 103248. Its totient is φ = 11456.

The previous prime is 42989. The next prime is 43003. The reversal of 42990 is 9924.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 42990.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 42990.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 687 + ... + 746.

It is an arithmetic number, because the mean of its divisors is an integer number (6453).

2⁴²⁹⁹⁰ is an apocalyptic number.

42990 is an abundant number, since it is smaller than the sum of its proper divisors (60258).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51624).

42990 is a wasteful number, since it uses less digits than its factorization.

42990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 42990 is about 207.3402999901. The cubic root of 42990 is about 35.0312645809.

The spelling of 42990 in words is "forty-two thousand, nine hundred ninety".