420938807 has 2 divisors, whose sum is σ = 420938808. Its totient is φ = 420938806.

The previous prime is 420938783. The next prime is 420938809. The reversal of 420938807 is 708839024.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420938807 is a prime.

Together with 420938809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420938809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210469403 + 210469404.

It is an arithmetic number, because the mean of its divisors is an integer number (210469404).

Almost surely, 2^420938807 is an apocalyptic number.

420938807 is a deficient number, since it is larger than the sum of its proper divisors (1).

420938807 is an equidigital number, since it uses as much as digits as its factorization.

420938807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 420938807 is about 20516.7932923252. The cubic root of 420938807 is about 749.4448080803. Note that the first 3 decimals are identical.

The spelling of 420938807 in words is "four hundred twenty million, nine hundred thirty-eight thousand, eight hundred seven".