420420309 has 4 divisors (see below), whose sum is σ = 560560416. Its totient is φ = 280280204.

The previous prime is 420420281. The next prime is 420420317. The reversal of 420420309 is 903024024.

It is a happy number.

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 420420309 - 2⁸ = 420420053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420420379) 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, 70070049 + ... + 70070054.

It is an arithmetic number, because the mean of its divisors is an integer number (140140104).

Almost surely, 2^420420309 is an apocalyptic number.

It is an amenable number.

420420309 is a deficient number, since it is larger than the sum of its proper divisors (140140107).

420420309 is a wasteful number, since it uses less digits than its factorization.

420420309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140140106.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 420420309 is about 20504.1534572876. The cubic root of 420420309 is about 749.1369681712.

The spelling of 420420309 in words is "four hundred twenty million, four hundred twenty thousand, three hundred nine".