42247489 has 2 divisors, whose sum is σ = 42247490. Its totient is φ = 42247488.

The previous prime is 42247487. The next prime is 42247511. The reversal of 42247489 is 98474224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33837489 + 8410000 = 5817^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 42247489 - 2¹ = 42247487 is a prime.

It is a super-3 number, since 3×42247489³ (a number of 24 digits) contains 333 as substring.

Together with 42247487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42247487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21123744 + 21123745.

It is an arithmetic number, because the mean of its divisors is an integer number (21123745).

Almost surely, 2^42247489 is an apocalyptic number.

It is an amenable number.

42247489 is a deficient number, since it is larger than the sum of its proper divisors (1).

42247489 is an equidigital number, since it uses as much as digits as its factorization.

42247489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 40.

The square root of 42247489 is about 6499.8068432839. The cubic root of 42247489 is about 348.2840883863.

The spelling of 42247489 in words is "forty-two million, two hundred forty-seven thousand, four hundred eighty-nine".