42505427 has 2 divisors, whose sum is σ = 42505428. Its totient is φ = 42505426.

The previous prime is 42505381. The next prime is 42505447. The reversal of 42505427 is 72450524.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42505427 - 2⁶ = 42505363 is a prime.

It is a super-2 number, since 2×42505427² = 3613422648904658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42505427.

It is not a weakly prime, because it can be changed into another prime (42505447) 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 as a sum of consecutive naturals, namely, 21252713 + 21252714.

It is an arithmetic number, because the mean of its divisors is an integer number (21252714).

Almost surely, 2^42505427 is an apocalyptic number.

42505427 is a deficient number, since it is larger than the sum of its proper divisors (1).

42505427 is an equidigital number, since it uses as much as digits as its factorization.

42505427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 42505427 is about 6519.6186238154. The cubic root of 42505427 is about 348.9914557997.

The spelling of 42505427 in words is "forty-two million, five hundred five thousand, four hundred twenty-seven".