420001189 has 2 divisors, whose sum is σ = 420001190. Its totient is φ = 420001188.

The previous prime is 420001187. The next prime is 420001199. The reversal of 420001189 is 981100024.

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., 301300164 + 118701025 = 17358^2 + 10895^2 .

It is a cyclic number.

It is not a de Polignac number, because 420001189 - 2¹ = 420001187 is a prime.

It is a super-2 number, since 2×420001189² = 352801997522827442, which contains 22 as substring.

Together with 420001187, 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 (420001187) 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, 210000594 + 210000595.

It is an arithmetic number, because the mean of its divisors is an integer number (210000595).

Almost surely, 2^420001189 is an apocalyptic number.

It is an amenable number.

420001189 is a deficient number, since it is larger than the sum of its proper divisors (1).

420001189 is an equidigital number, since it uses as much as digits as its factorization.

420001189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 420001189 is about 20493.9305405283. The cubic root of 420001189 is about 748.8879454092.

The spelling of 420001189 in words is "four hundred twenty million, one thousand, one hundred eighty-nine".