420340447 has 8 divisors (see below), whose sum is σ = 428624352. Its totient is φ = 412101600.

The previous prime is 420340441. The next prime is 420340493. The reversal of 420340447 is 744043024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420340447 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 (420340441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7893 + ... + 30049.

It is an arithmetic number, because the mean of its divisors is an integer number (53578044).

Almost surely, 2^420340447 is an apocalyptic number.

420340447 is a deficient number, since it is larger than the sum of its proper divisors (8283905).

420340447 is a wasteful number, since it uses less digits than its factorization.

420340447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22529.

The product of its (nonzero) digits is 10752, while the sum is 28.

The square root of 420340447 is about 20502.2059057068. The cubic root of 420340447 is about 749.0895304334.

The spelling of 420340447 in words is "four hundred twenty million, three hundred forty thousand, four hundred forty-seven".