42758 has 4 divisors (see below), whose sum is σ = 64140. Its totient is φ = 21378.

The previous prime is 42751. The next prime is 42767. The reversal of 42758 is 85724.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688 + ... + 10691.

It is an arithmetic number, because the mean of its divisors is an integer number (16035).

2⁴²⁷⁵⁸ is an apocalyptic number.

42758 is a deficient number, since it is larger than the sum of its proper divisors (21382).

42758 is a wasteful number, since it uses less digits than its factorization.

42758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21381.

The product of its digits is 2240, while the sum is 26.

The square root of 42758 is about 206.7800764097. The cubic root of 42758 is about 34.9681342620.

The spelling of 42758 in words is "forty-two thousand, seven hundred fifty-eight".