42799 has 4 divisors (see below), whose sum is σ = 43264. Its totient is φ = 42336.

The previous prime is 42797. The next prime is 42821. The reversal of 42799 is 99724.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 5-Lehmer number, since φ(42799) divides (42799-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 42799 - 2¹ = 42797 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 42799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42793) 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, 42 + ... + 295.

It is an arithmetic number, because the mean of its divisors is an integer number (10816).

It is a Poulet number, since it divides 2⁴²⁷⁹⁸-1.

2⁴²⁷⁹⁹ is an apocalyptic number.

42799 is a deficient number, since it is larger than the sum of its proper divisors (465).

42799 is a wasteful number, since it uses less digits than its factorization.

42799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464.

The product of its digits is 4536, while the sum is 31.

The square root of 42799 is about 206.8791918004. The cubic root of 42799 is about 34.9793074966.

It can be divided in two parts, 42 and 799, that added together give a square (841 = 29²).

The spelling of 42799 in words is "forty-two thousand, seven hundred ninety-nine".