420143509 has 4 divisors (see below), whose sum is σ = 420265120. Its totient is φ = 420021900.

The previous prime is 420143501. The next prime is 420143519. The reversal of 420143509 is 905341024.

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 420143509 - 2³ = 420143501 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 (420143501) 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, 55467 + ... + 62584.

It is an arithmetic number, because the mean of its divisors is an integer number (105066280).

Almost surely, 2^420143509 is an apocalyptic number.

It is an amenable number.

420143509 is a deficient number, since it is larger than the sum of its proper divisors (121611).

420143509 is a wasteful number, since it uses less digits than its factorization.

420143509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121610.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 420143509 is about 20497.4024939747. The cubic root of 420143509 is about 748.9725242936.

The spelling of 420143509 in words is "four hundred twenty million, one hundred forty-three thousand, five hundred nine".