42871823 has 2 divisors, whose sum is σ = 42871824. Its totient is φ = 42871822.

The previous prime is 42871811. The next prime is 42871877. The reversal of 42871823 is 32817824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42871823 - 2¹⁶ = 42806287 is a prime.

It is equal to p_2597291 and since 42871823 and 2597291 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42771823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21435911 + 21435912.

It is an arithmetic number, because the mean of its divisors is an integer number (21435912).

Almost surely, 2^42871823 is an apocalyptic number.

42871823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42871823 is an equidigital number, since it uses as much as digits as its factorization.

42871823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 42871823 is about 6547.6578255129. The cubic root of 42871823 is about 349.9913548885.

The spelling of 42871823 in words is "forty-two million, eight hundred seventy-one thousand, eight hundred twenty-three".