420669309 has 8 divisors (see below), whose sum is σ = 566675200. Its totient is φ = 277554816.

The previous prime is 420669283. The next prime is 420669311. The reversal of 420669309 is 903966024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420669309 - 2²⁵ = 387114877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420669209) 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 in 7 ways as a sum of consecutive naturals, for example, 722509 + ... + 723090.

It is an arithmetic number, because the mean of its divisors is an integer number (70834400).

Almost surely, 2^420669309 is an apocalyptic number.

It is an amenable number.

420669309 is a deficient number, since it is larger than the sum of its proper divisors (146005891).

420669309 is a wasteful number, since it uses less digits than its factorization.

420669309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445699.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 420669309 is about 20510.2244990151. The cubic root of 420669309 is about 749.2848347127.

The spelling of 420669309 in words is "four hundred twenty million, six hundred sixty-nine thousand, three hundred nine".