420402001 has 2 divisors, whose sum is σ = 420402002. Its totient is φ = 420402000.

The previous prime is 420401983. The next prime is 420402023. The reversal of 420402001 is 100204024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306425025 + 113976976 = 17505^2 + 10676^2 .

It is a cyclic number.

It is not a de Polignac number, because 420402001 - 2⁹ = 420401489 is a prime.

It is not a weakly prime, because it can be changed into another prime (420402041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210201000 + 210201001.

It is an arithmetic number, because the mean of its divisors is an integer number (210201001).

Almost surely, 2^420402001 is an apocalyptic number.

It is an amenable number.

420402001 is a deficient number, since it is larger than the sum of its proper divisors (1).

420402001 is an equidigital number, since it uses as much as digits as its factorization.

420402001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 420402001 is about 20503.7070062952. The cubic root of 420402001 is about 749.1260938165.

Adding to 420402001 its reverse (100204024), we get a palindrome (520606025).

The spelling of 420402001 in words is "four hundred twenty million, four hundred two thousand, one".