420005447 has 2 divisors, whose sum is σ = 420005448. Its totient is φ = 420005446.

The previous prime is 420005437. The next prime is 420005479. The reversal of 420005447 is 744500024.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420005447 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 (420005407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210002723 + 210002724.

It is an arithmetic number, because the mean of its divisors is an integer number (210002724).

Almost surely, 2^420005447 is an apocalyptic number.

420005447 is a deficient number, since it is larger than the sum of its proper divisors (1).

420005447 is an equidigital number, since it uses as much as digits as its factorization.

420005447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 420005447 is about 20494.0344246808. The cubic root of 420005447 is about 748.8904761593.

The spelling of 420005447 in words is "four hundred twenty million, five thousand, four hundred forty-seven".