42008881 has 2 divisors, whose sum is σ = 42008882. Its totient is φ = 42008880.

The previous prime is 42008843. The next prime is 42008891. The reversal of 42008881 is 18880024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39891856 + 2117025 = 6316^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 42008881 - 2¹⁷ = 41877809 is a prime.

It is a super-2 number, since 2×42008881² = 3529492165744322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42008891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21004440 + 21004441.

It is an arithmetic number, because the mean of its divisors is an integer number (21004441).

Almost surely, 2^42008881 is an apocalyptic number.

It is an amenable number.

42008881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42008881 is an equidigital number, since it uses as much as digits as its factorization.

42008881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 42008881 is about 6481.4258462162. The cubic root of 42008881 is about 347.6271632323.

The spelling of 42008881 in words is "forty-two million, eight thousand, eight hundred eighty-one".