42538849 has 2 divisors, whose sum is σ = 42538850. Its totient is φ = 42538848.

The previous prime is 42538843. The next prime is 42538861. The reversal of 42538849 is 94883524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 19642624 = 4785^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 42538849 - 2⁵ = 42538817 is a prime.

It is not a weakly prime, because it can be changed into another prime (42538843) 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, 21269424 + 21269425.

It is an arithmetic number, because the mean of its divisors is an integer number (21269425).

Almost surely, 2^42538849 is an apocalyptic number.

It is an amenable number.

42538849 is a deficient number, since it is larger than the sum of its proper divisors (1).

42538849 is an equidigital number, since it uses as much as digits as its factorization.

42538849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 43.

The square root of 42538849 is about 6522.1813068942. The cubic root of 42538849 is about 349.0829024491.

The spelling of 42538849 in words is "forty-two million, five hundred thirty-eight thousand, eight hundred forty-nine".