421769857 has 2 divisors, whose sum is σ = 421769858. Its totient is φ = 421769856.

The previous prime is 421769833. The next prime is 421769863. The reversal of 421769857 is 758967124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 294328336 + 127441521 = 17156^2 + 11289^2 .

It is a cyclic number.

It is not a de Polignac number, because 421769857 - 2¹⁹ = 421245569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421769857.

It is not a weakly prime, because it can be changed into another prime (421769807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210884928 + 210884929.

It is an arithmetic number, because the mean of its divisors is an integer number (210884929).

Almost surely, 2^421769857 is an apocalyptic number.

It is an amenable number.

421769857 is a deficient number, since it is larger than the sum of its proper divisors (1).

421769857 is an equidigital number, since it uses as much as digits as its factorization.

421769857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 421769857 is about 20537.0362272651. The cubic root of 421769857 is about 749.9376878601.

The spelling of 421769857 in words is "four hundred twenty-one million, seven hundred sixty-nine thousand, eight hundred fifty-seven".