420436637 has 2 divisors, whose sum is σ = 420436638. Its totient is φ = 420436636.

The previous prime is 420436613. The next prime is 420436721. The reversal of 420436637 is 736634024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 418570681 + 1865956 = 20459^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 420436637 - 2⁸ = 420436381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420436597 and 420436606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420436607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210218318 + 210218319.

It is an arithmetic number, because the mean of its divisors is an integer number (210218319).

Almost surely, 2^420436637 is an apocalyptic number.

It is an amenable number.

420436637 is a deficient number, since it is larger than the sum of its proper divisors (1).

420436637 is an equidigital number, since it uses as much as digits as its factorization.

420436637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 35.

The square root of 420436637 is about 20504.5516166533. The cubic root of 420436637 is about 749.1466662042.

The spelling of 420436637 in words is "four hundred twenty million, four hundred thirty-six thousand, six hundred thirty-seven".