420724453 has 2 divisors, whose sum is σ = 420724454. Its totient is φ = 420724452.

The previous prime is 420724433. The next prime is 420724459. The reversal of 420724453 is 354427024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415262884 + 5461569 = 20378^2 + 2337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420724453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420724459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210362226 + 210362227.

It is an arithmetic number, because the mean of its divisors is an integer number (210362227).

Almost surely, 2^420724453 is an apocalyptic number.

It is an amenable number.

420724453 is a deficient number, since it is larger than the sum of its proper divisors (1).

420724453 is an equidigital number, since it uses as much as digits as its factorization.

420724453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 31.

The square root of 420724453 is about 20511.5687600924. The cubic root of 420724453 is about 749.3175736177.

The spelling of 420724453 in words is "four hundred twenty million, seven hundred twenty-four thousand, four hundred fifty-three".