421620769 has 2 divisors, whose sum is σ = 421620770. Its totient is φ = 421620768.

The previous prime is 421620733. The next prime is 421620799. The reversal of 421620769 is 967026124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255520225 + 166100544 = 15985^2 + 12888^2 .

It is a cyclic number.

It is not a de Polignac number, because 421620769 - 2²³ = 413232161 is a prime.

It is a super-2 number, since 2×421620769² = 355528145704302722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421620799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210810384 + 210810385.

It is an arithmetic number, because the mean of its divisors is an integer number (210810385).

Almost surely, 2^421620769 is an apocalyptic number.

It is an amenable number.

421620769 is a deficient number, since it is larger than the sum of its proper divisors (1).

421620769 is an equidigital number, since it uses as much as digits as its factorization.

421620769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 421620769 is about 20533.4061714076. The cubic root of 421620769 is about 749.8493143197.

The spelling of 421620769 in words is "four hundred twenty-one million, six hundred twenty thousand, seven hundred sixty-nine".