47858 has 4 divisors (see below), whose sum is σ = 71790. Its totient is φ = 23928.

The previous prime is 47857. The next prime is 47869. The reversal of 47858 is 85874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85874 = 2 ⋅42937.

It can be written as a sum of positive squares in only one way, i.e., 37249 + 10609 = 193^2 + 103^2 .

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11963 + ... + 11966.

2⁴⁷⁸⁵⁸ is an apocalyptic number.

47858 is a deficient number, since it is larger than the sum of its proper divisors (23932).

47858 is a wasteful number, since it uses less digits than its factorization.

47858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23931.

The product of its digits is 8960, while the sum is 32.

The square root of 47858 is about 218.7647137909. The cubic root of 47858 is about 36.3065388024.

The spelling of 47858 in words is "forty-seven thousand, eight hundred fifty-eight".