421643339 has 6 divisors (see below), whose sum is σ = 456572556. Its totient is φ = 389209080.

The previous prime is 421643309. The next prime is 421643353. The reversal of 421643339 is 933346124.

It is not a de Polignac number, because 421643339 - 2¹⁶ = 421577803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421643299 and 421643308.

It is not an unprimeable number, because it can be changed into a prime (421643309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1247297 + ... + 1247634.

It is an arithmetic number, because the mean of its divisors is an integer number (76095426).

Almost surely, 2^421643339 is an apocalyptic number.

421643339 is a deficient number, since it is larger than the sum of its proper divisors (34929217).

421643339 is a wasteful number, since it uses less digits than its factorization.

421643339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494957 (or 2494944 counting only the distinct ones).

The product of its digits is 46656, while the sum is 35.

The square root of 421643339 is about 20533.9557562589. The cubic root of 421643339 is about 749.8626942718.

The spelling of 421643339 in words is "four hundred twenty-one million, six hundred forty-three thousand, three hundred thirty-nine".