420404401 has 2 divisors, whose sum is σ = 420404402. Its totient is φ = 420404400.

The previous prime is 420404371. The next prime is 420404461. The reversal of 420404401 is 104404024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404010000 + 16394401 = 20100^2 + 4049^2 .

It is a cyclic number.

It is not a de Polignac number, because 420404401 - 2⁷ = 420404273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420404461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210202200 + 210202201.

It is an arithmetic number, because the mean of its divisors is an integer number (210202201).

Almost surely, 2^420404401 is an apocalyptic number.

It is an amenable number.

420404401 is a deficient number, since it is larger than the sum of its proper divisors (1).

420404401 is an equidigital number, since it uses as much as digits as its factorization.

420404401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 420404401 is about 20503.7655322138. The cubic root of 420404401 is about 749.1275193562.

Adding to 420404401 its reverse (104404024), we get a palindrome (524808425).

The spelling of 420404401 in words is "four hundred twenty million, four hundred four thousand, four hundred one".