42740449 has 2 divisors, whose sum is σ = 42740450. Its totient is φ = 42740448.

The previous prime is 42740441. The next prime is 42740471. The reversal of 42740449 is 94404724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36084049 + 6656400 = 6007^2 + 2580^2 .

It is a cyclic number.

It is not a de Polignac number, because 42740449 - 2³ = 42740441 is a prime.

It is not a weakly prime, because it can be changed into another prime (42740441) 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, 21370224 + 21370225.

It is an arithmetic number, because the mean of its divisors is an integer number (21370225).

Almost surely, 2^42740449 is an apocalyptic number.

It is an amenable number.

42740449 is a deficient number, since it is larger than the sum of its proper divisors (1).

42740449 is an equidigital number, since it uses as much as digits as its factorization.

42740449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 42740449 is about 6537.6179912870. The cubic root of 42740449 is about 349.6334911675.

The spelling of 42740449 in words is "forty-two million, seven hundred forty thousand, four hundred forty-nine".