42439489 has 2 divisors, whose sum is σ = 42439490. Its totient is φ = 42439488.

The previous prime is 42439471. The next prime is 42439583. The reversal of 42439489 is 98493424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34904464 + 7535025 = 5908^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 42439489 - 2¹⁹ = 41915201 is a prime.

It is a super-2 number, since 2×42439489² = 3602220453162242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42430489) 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, 21219744 + 21219745.

It is an arithmetic number, because the mean of its divisors is an integer number (21219745).

Almost surely, 2^42439489 is an apocalyptic number.

It is an amenable number.

42439489 is a deficient number, since it is larger than the sum of its proper divisors (1).

42439489 is an equidigital number, since it uses as much as digits as its factorization.

42439489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 42439489 is about 6514.5597702377. The cubic root of 42439489 is about 348.8109007523.

The spelling of 42439489 in words is "forty-two million, four hundred thirty-nine thousand, four hundred eighty-nine".