421643338 has 8 divisors (see below), whose sum is σ = 652867200. Its totient is φ = 204020940.

The previous prime is 421643309. The next prime is 421643353. The reversal of 421643338 is 833346124.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400288 + ... + 3400411.

It is an arithmetic number, because the mean of its divisors is an integer number (81608400).

Almost surely, 2^421643338 is an apocalyptic number.

421643338 is a deficient number, since it is larger than the sum of its proper divisors (231223862).

421643338 is a wasteful number, since it uses less digits than its factorization.

421643338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6800732.

The product of its digits is 41472, while the sum is 34.

The square root of 421643338 is about 20533.9557319090. The cubic root of 421643338 is about 749.8626936790.

The spelling of 421643338 in words is "four hundred twenty-one million, six hundred forty-three thousand, three hundred thirty-eight".