420856669 has 4 divisors (see below), whose sum is σ = 443007040. Its totient is φ = 398706300.

The previous prime is 420856649. The next prime is 420856699. The reversal of 420856669 is 966658024.

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 420856669 - 2⁵ = 420856637 is a prime.

It is a super-2 number, since 2×420856669² = 354240671683551122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420856649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11075157 + ... + 11075194.

It is an arithmetic number, because the mean of its divisors is an integer number (110751760).

Almost surely, 2^420856669 is an apocalyptic number.

It is an amenable number.

420856669 is a deficient number, since it is larger than the sum of its proper divisors (22150371).

420856669 is a wasteful number, since it uses less digits than its factorization.

420856669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22150370.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 420856669 is about 20514.7914685965. The cubic root of 420856669 is about 749.3960583959.

The spelling of 420856669 in words is "four hundred twenty million, eight hundred fifty-six thousand, six hundred sixty-nine".