420001 has 2 divisors, whose sum is σ = 420002. Its totient is φ = 420000.

The previous prime is 419999. The next prime is 420029. The reversal of 420001 is 100024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389376 + 30625 = 624^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 420001 - 2¹ = 419999 is a prime.

Together with 419999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210000 + 210001.

It is an arithmetic number, because the mean of its divisors is an integer number (210001).

2⁴²⁰⁰⁰¹ is an apocalyptic number.

It is an amenable number.

420001 is a deficient number, since it is larger than the sum of its proper divisors (1).

420001 is an equidigital number, since it uses as much as digits as its factorization.

420001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 420001 is about 648.0748413571. The cubic root of 420001 is about 74.8887833076. Note that the first 3 decimals are identical.

Adding to 420001 its reverse (100024), we get a palindrome (520025).

The spelling of 420001 in words is "four hundred twenty thousand, one", and thus it is an iban number.