42099 has 4 divisors (see below), whose sum is σ = 56136. Its totient is φ = 28064.

The previous prime is 42089. The next prime is 42101. The reversal of 42099 is 99024.

42099 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42099 - 2⁴ = 42083 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (42019) 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, 7014 + ... + 7019.

It is an arithmetic number, because the mean of its divisors is an integer number (14034).

2⁴²⁰⁹⁹ is an apocalyptic number.

42099 is a deficient number, since it is larger than the sum of its proper divisors (14037).

42099 is a wasteful number, since it uses less digits than its factorization.

42099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14036.

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

The square root of 42099 is about 205.1804084215. The cubic root of 42099 is about 34.7875566557.

The spelling of 42099 in words is "forty-two thousand, ninety-nine".