420000389 has 2 divisors, whose sum is σ = 420000390. Its totient is φ = 420000388.

The previous prime is 420000349. The next prime is 420000391. The reversal of 420000389 is 983000024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277389025 + 142611364 = 16655^2 + 11942^2 .

It is a cyclic number.

It is not a de Polignac number, because 420000389 - 2²⁴ = 403223173 is a prime.

Together with 420000391, 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 (420000349) 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, 210000194 + 210000195.

It is an arithmetic number, because the mean of its divisors is an integer number (210000195).

Almost surely, 2^420000389 is an apocalyptic number.

It is an amenable number.

420000389 is a deficient number, since it is larger than the sum of its proper divisors (1).

420000389 is an equidigital number, since it uses as much as digits as its factorization.

420000389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 420000389 is about 20493.9110225452. The cubic root of 420000389 is about 748.8874699259.

The spelling of 420000389 in words is "four hundred twenty million, three hundred eighty-nine", and thus it is an aban number.