42520447 has 2 divisors, whose sum is σ = 42520448. Its totient is φ = 42520446.

The previous prime is 42520441. The next prime is 42520487. The reversal of 42520447 is 74402524.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42520447 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42520441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260223 + 21260224.

It is an arithmetic number, because the mean of its divisors is an integer number (21260224).

Almost surely, 2^42520447 is an apocalyptic number.

42520447 is a deficient number, since it is larger than the sum of its proper divisors (1).

42520447 is an equidigital number, since it uses as much as digits as its factorization.

42520447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 42520447 is about 6520.7704299415. The cubic root of 42520447 is about 349.0325582716.

The spelling of 42520447 in words is "forty-two million, five hundred twenty thousand, four hundred forty-seven".