42404489 has 2 divisors, whose sum is σ = 42404490. Its totient is φ = 42404488.

The previous prime is 42404471. The next prime is 42404503. The reversal of 42404489 is 98440424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41925625 + 478864 = 6475^2 + 692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42404489 is a prime.

It is a super-2 number, since 2×42404489² = 3596281374702242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42404419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202244 + 21202245.

It is an arithmetic number, because the mean of its divisors is an integer number (21202245).

Almost surely, 2^42404489 is an apocalyptic number.

It is an amenable number.

42404489 is a deficient number, since it is larger than the sum of its proper divisors (1).

42404489 is an equidigital number, since it uses as much as digits as its factorization.

42404489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 42404489 is about 6511.8729256643. The cubic root of 42404489 is about 348.7149858434.

The spelling of 42404489 in words is "forty-two million, four hundred four thousand, four hundred eighty-nine".