420499789 has 2 divisors, whose sum is σ = 420499790. Its totient is φ = 420499788.

The previous prime is 420499787. The next prime is 420499801. The reversal of 420499789 is 987994024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390062500 + 30437289 = 19750^2 + 5517^2 .

It is a cyclic number.

It is not a de Polignac number, because 420499789 - 2¹ = 420499787 is a prime.

Together with 420499787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420499787) by changing a digit.

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 as a sum of consecutive naturals, namely, 210249894 + 210249895.

It is an arithmetic number, because the mean of its divisors is an integer number (210249895).

Almost surely, 2^420499789 is an apocalyptic number.

It is an amenable number.

420499789 is a deficient number, since it is larger than the sum of its proper divisors (1).

420499789 is an equidigital number, since it uses as much as digits as its factorization.

420499789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 420499789 is about 20506.0915095978. The cubic root of 420499789 is about 749.1841730384.

The spelling of 420499789 in words is "four hundred twenty million, four hundred ninety-nine thousand, seven hundred eighty-nine".