420824869 has 4 divisors (see below), whose sum is σ = 420877440. Its totient is φ = 420772300.

The previous prime is 420824849. The next prime is 420824891. The reversal of 420824869 is 968428024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420824869 - 2⁷ = 420824741 is a prime.

It is a super-2 number, since 2×420824869² = 354187140737734322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420824839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11509 + ... + 31210.

It is an arithmetic number, because the mean of its divisors is an integer number (105219360).

Almost surely, 2^420824869 is an apocalyptic number.

It is an amenable number.

420824869 is a deficient number, since it is larger than the sum of its proper divisors (52571).

420824869 is an equidigital number, since it uses as much as digits as its factorization.

420824869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52570.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 420824869 is about 20514.0164034252. The cubic root of 420824869 is about 749.3771830901.

The spelling of 420824869 in words is "four hundred twenty million, eight hundred twenty-four thousand, eight hundred sixty-nine".