42787 has 2 divisors, whose sum is σ = 42788. Its totient is φ = 42786.

The previous prime is 42773. The next prime is 42793. The reversal of 42787 is 78724.

42787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42787 - 2¹¹ = 40739 is a prime.

It is not a weakly prime, because it can be changed into another prime (42727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21393 + 21394.

It is an arithmetic number, because the mean of its divisors is an integer number (21394).

2⁴²⁷⁸⁷ is an apocalyptic number.

42787 is a deficient number, since it is larger than the sum of its proper divisors (1).

42787 is an equidigital number, since it uses as much as digits as its factorization.

42787 is an evil number, because the sum of its binary digits is even.

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

The square root of 42787 is about 206.8501873337. The cubic root of 42787 is about 34.9760380205.

Subtracting 42787 from its reverse (78724), we obtain a cube (35937 = 33³).

The spelling of 42787 in words is "forty-two thousand, seven hundred eighty-seven".