420208447 has 4 divisors (see below), whose sum is σ = 421551280. Its totient is φ = 418865616.

The previous prime is 420208417. The next prime is 420208457. The reversal of 420208447 is 744802024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420208447 - 2¹¹ = 420206399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420208417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670947 + ... + 671572.

It is an arithmetic number, because the mean of its divisors is an integer number (105387820).

Almost surely, 2^420208447 is an apocalyptic number.

420208447 is a deficient number, since it is larger than the sum of its proper divisors (1342833).

420208447 is a wasteful number, since it uses less digits than its factorization.

420208447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342832.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 420208447 is about 20498.9864871413. The cubic root of 420208447 is about 749.0111097382.

The spelling of 420208447 in words is "four hundred twenty million, two hundred eight thousand, four hundred forty-seven".