42447409 has 2 divisors, whose sum is σ = 42447410. Its totient is φ = 42447408.

The previous prime is 42447367. The next prime is 42447413. The reversal of 42447409 is 90474424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41563809 + 883600 = 6447^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 42447409 - 2⁷ = 42447281 is a prime.

It is not a weakly prime, because it can be changed into another prime (42447479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21223704 + 21223705.

It is an arithmetic number, because the mean of its divisors is an integer number (21223705).

Almost surely, 2^42447409 is an apocalyptic number.

It is an amenable number.

42447409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42447409 is an equidigital number, since it uses as much as digits as its factorization.

42447409 is an evil number, because the sum of its binary digits is even.

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

The square root of 42447409 is about 6515.1676110442. The cubic root of 42447409 is about 348.8325976087.

The spelling of 42447409 in words is "forty-two million, four hundred forty-seven thousand, four hundred nine".