42089917 has 2 divisors, whose sum is σ = 42089918. Its totient is φ = 42089916.

The previous prime is 42089899. The next prime is 42089963. The reversal of 42089917 is 71998024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41912676 + 177241 = 6474^2 + 421^2 .

It is a cyclic number.

It is not a de Polignac number, because 42089917 - 2¹⁵ = 42057149 is a prime.

It is a super-2 number, since 2×42089917² = 3543122226133778, 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 42089917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42089417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21044958 + 21044959.

It is an arithmetic number, because the mean of its divisors is an integer number (21044959).

Almost surely, 2^42089917 is an apocalyptic number.

It is an amenable number.

42089917 is a deficient number, since it is larger than the sum of its proper divisors (1).

42089917 is an equidigital number, since it uses as much as digits as its factorization.

42089917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 42089917 is about 6487.6742365812. The cubic root of 42089917 is about 347.8505463187.

The spelling of 42089917 in words is "forty-two million, eighty-nine thousand, nine hundred seventeen".