420797789 has 2 divisors, whose sum is σ = 420797790. Its totient is φ = 420797788.

The previous prime is 420797779. The next prime is 420797791. The reversal of 420797789 is 987797024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 419020900 + 1776889 = 20470^2 + 1333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420797789 is a prime.

Together with 420797791, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420797789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420797779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210398894 + 210398895.

It is an arithmetic number, because the mean of its divisors is an integer number (210398895).

Almost surely, 2^420797789 is an apocalyptic number.

It is an amenable number.

420797789 is a deficient number, since it is larger than the sum of its proper divisors (1).

420797789 is an equidigital number, since it uses as much as digits as its factorization.

420797789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 420797789 is about 20513.3563562865. The cubic root of 420797789 is about 749.3611086524.

The spelling of 420797789 in words is "four hundred twenty million, seven hundred ninety-seven thousand, seven hundred eighty-nine".