42508243 has 2 divisors, whose sum is σ = 42508244. Its totient is φ = 42508242.

The previous prime is 42508183. The next prime is 42508309. The reversal of 42508243 is 34280524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42508243 - 2²⁵ = 8953811 is a prime.

It is not a weakly prime, because it can be changed into another prime (42508343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21254121 + 21254122.

It is an arithmetic number, because the mean of its divisors is an integer number (21254122).

Almost surely, 2^42508243 is an apocalyptic number.

42508243 is a deficient number, since it is larger than the sum of its proper divisors (1).

42508243 is an equidigital number, since it uses as much as digits as its factorization.

42508243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 42508243 is about 6519.8345837912. The cubic root of 42508243 is about 348.9991625664. Note that the first 3 decimals are identical.

Adding to 42508243 its reverse (34280524), we get a palindrome (76788767).

The spelling of 42508243 in words is "forty-two million, five hundred eight thousand, two hundred forty-three".