42019489 has 2 divisors, whose sum is σ = 42019490. Its totient is φ = 42019488.

The previous prime is 42019487. The next prime is 42019493. The reversal of 42019489 is 98491024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38750625 + 3268864 = 6225^2 + 1808^2 .

It is a cyclic number.

It is not a de Polignac number, because 42019489 - 2¹ = 42019487 is a prime.

It is a super-2 number, since 2×42019489² = 3531274911642242, which contains 22 as substring.

Together with 42019487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42019487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21009744 + 21009745.

It is an arithmetic number, because the mean of its divisors is an integer number (21009745).

Almost surely, 2^42019489 is an apocalyptic number.

It is an amenable number.

42019489 is a deficient number, since it is larger than the sum of its proper divisors (1).

42019489 is an equidigital number, since it uses as much as digits as its factorization.

42019489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 42019489 is about 6482.2441330144. The cubic root of 42019489 is about 347.6564214789.

The spelling of 42019489 in words is "forty-two million, nineteen thousand, four hundred eighty-nine".