420244823 has 2 divisors, whose sum is σ = 420244824. Its totient is φ = 420244822.

The previous prime is 420244789. The next prime is 420244843. The reversal of 420244823 is 328442024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420244823 - 2⁸ = 420244567 is a prime.

It is a super-2 number, since 2×420244823² = 353211422516602658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420244843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210122411 + 210122412.

It is an arithmetic number, because the mean of its divisors is an integer number (210122412).

Almost surely, 2^420244823 is an apocalyptic number.

420244823 is a deficient number, since it is larger than the sum of its proper divisors (1).

420244823 is an equidigital number, since it uses as much as digits as its factorization.

420244823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 29.

The square root of 420244823 is about 20499.8737313184. The cubic root of 420244823 is about 749.0327222197.

Adding to 420244823 its reverse (328442024), we get a palindrome (748686847).

The spelling of 420244823 in words is "four hundred twenty million, two hundred forty-four thousand, eight hundred twenty-three".