42877 has 4 divisors (see below), whose sum is σ = 43740. Its totient is φ = 42016.

The previous prime is 42863. The next prime is 42899. The reversal of 42877 is 77824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34596 + 8281 = 186^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 42877 - 2¹¹ = 40829 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42577) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 352 + ... + 457.

It is an arithmetic number, because the mean of its divisors is an integer number (10935).

2⁴²⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

42877 is a deficient number, since it is larger than the sum of its proper divisors (863).

42877 is an equidigital number, since it uses as much as digits as its factorization.

42877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its digits is 3136, while the sum is 28.

The square root of 42877 is about 207.0676218051. The cubic root of 42877 is about 35.0005442092. Note that the first 3 decimals are identical.

Subtracting from 42877 its sum of digits (28), we obtain a square (42849 = 207²).

It can be divided in two parts, 428 and 77, that added together give a palindrome (505).

The spelling of 42877 in words is "forty-two thousand, eight hundred seventy-seven".