420728339 has 2 divisors, whose sum is σ = 420728340. Its totient is φ = 420728338.

The previous prime is 420728281. The next prime is 420728389. The reversal of 420728339 is 933827024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420728339 - 2²⁰ = 419679763 is a prime.

It is not a weakly prime, because it can be changed into another prime (420728389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210364169 + 210364170.

It is an arithmetic number, because the mean of its divisors is an integer number (210364170).

Almost surely, 2^420728339 is an apocalyptic number.

420728339 is a deficient number, since it is larger than the sum of its proper divisors (1).

420728339 is an equidigital number, since it uses as much as digits as its factorization.

420728339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 420728339 is about 20511.6634869042. The cubic root of 420728339 is about 749.3198806218.

The spelling of 420728339 in words is "four hundred twenty million, seven hundred twenty-eight thousand, three hundred thirty-nine".