42309871 has 2 divisors, whose sum is σ = 42309872. Its totient is φ = 42309870.

The previous prime is 42309803. The next prime is 42309877. The reversal of 42309871 is 17890324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42309871 - 2⁹ = 42309359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42309877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21154935 + 21154936.

It is an arithmetic number, because the mean of its divisors is an integer number (21154936).

Almost surely, 2^42309871 is an apocalyptic number.

42309871 is a deficient number, since it is larger than the sum of its proper divisors (1).

42309871 is an equidigital number, since it uses as much as digits as its factorization.

42309871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 42309871 is about 6504.6038311338. The cubic root of 42309871 is about 348.4554277449.

The spelling of 42309871 in words is "forty-two million, three hundred nine thousand, eight hundred seventy-one".