420047989 has 2 divisors, whose sum is σ = 420047990. Its totient is φ = 420047988.

The previous prime is 420047983. The next prime is 420048001. The reversal of 420047989 is 989740024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 290429764 + 129618225 = 17042^2 + 11385^2 .

It is a cyclic number.

It is not a de Polignac number, because 420047989 - 2⁹ = 420047477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420047983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210023994 + 210023995.

It is an arithmetic number, because the mean of its divisors is an integer number (210023995).

Almost surely, 2^420047989 is an apocalyptic number.

It is an amenable number.

420047989 is a deficient number, since it is larger than the sum of its proper divisors (1).

420047989 is an equidigital number, since it uses as much as digits as its factorization.

420047989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 420047989 is about 20495.0723101920. The cubic root of 420047989 is about 748.9157601354.

The spelling of 420047989 in words is "four hundred twenty million, forty-seven thousand, nine hundred eighty-nine".