420688673 has 2 divisors, whose sum is σ = 420688674. Its totient is φ = 420688672.

The previous prime is 420688669. The next prime is 420688679. The reversal of 420688673 is 376886024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 277455649 + 143233024 = 16657^2 + 11968^2 .

It is a cyclic number.

It is not a de Polignac number, because 420688673 - 2² = 420688669 is a prime.

It is not a weakly prime, because it can be changed into another prime (420688679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210344336 + 210344337.

It is an arithmetic number, because the mean of its divisors is an integer number (210344337).

Almost surely, 2^420688673 is an apocalyptic number.

It is an amenable number.

420688673 is a deficient number, since it is larger than the sum of its proper divisors (1).

420688673 is an equidigital number, since it uses as much as digits as its factorization.

420688673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 420688673 is about 20510.6965508244. The cubic root of 420688673 is about 749.2963314146.

The spelling of 420688673 in words is "four hundred twenty million, six hundred eighty-eight thousand, six hundred seventy-three".