420746917 has 2 divisors, whose sum is σ = 420746918. Its totient is φ = 420746916.

The previous prime is 420746903. The next prime is 420746927. The reversal of 420746917 is 719647024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420701121 + 45796 = 20511^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 420746917 - 2¹¹ = 420744869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420746917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420746927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210373458 + 210373459.

It is an arithmetic number, because the mean of its divisors is an integer number (210373459).

Almost surely, 2^420746917 is an apocalyptic number.

It is an amenable number.

420746917 is a deficient number, since it is larger than the sum of its proper divisors (1).

420746917 is an equidigital number, since it uses as much as digits as its factorization.

420746917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 420746917 is about 20512.1163461989. The cubic root of 420746917 is about 749.3309096387.

The spelling of 420746917 in words is "four hundred twenty million, seven hundred forty-six thousand, nine hundred seventeen".