42405523 has 2 divisors, whose sum is σ = 42405524. Its totient is φ = 42405522.

The previous prime is 42405509. The next prime is 42405527. The reversal of 42405523 is 32550424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42405523 - 2²⁵ = 8851091 is a prime.

It is not a weakly prime, because it can be changed into another prime (42405527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202761 + 21202762.

It is an arithmetic number, because the mean of its divisors is an integer number (21202762).

Almost surely, 2^42405523 is an apocalyptic number.

42405523 is a deficient number, since it is larger than the sum of its proper divisors (1).

42405523 is an equidigital number, since it uses as much as digits as its factorization.

42405523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 42405523 is about 6511.9523186215. The cubic root of 42405523 is about 348.7178202003.

Adding to 42405523 its reverse (32550424), we get a palindrome (74955947).

The spelling of 42405523 in words is "forty-two million, four hundred five thousand, five hundred twenty-three".