420146509 has 4 divisors (see below), whose sum is σ = 420193216. Its totient is φ = 420099804.

The previous prime is 420146491. The next prime is 420146513. The reversal of 420146509 is 905641024.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420146509 - 2¹⁷ = 420015437 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 (420146539) 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, 5109 + ... + 29434.

It is an arithmetic number, because the mean of its divisors is an integer number (105048304).

Almost surely, 2^420146509 is an apocalyptic number.

It is an amenable number.

420146509 is a deficient number, since it is larger than the sum of its proper divisors (46707).

420146509 is a wasteful number, since it uses less digits than its factorization.

420146509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46706.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 420146509 is about 20497.4756738482. The cubic root of 420146509 is about 748.9743069482.

The spelling of 420146509 in words is "four hundred twenty million, one hundred forty-six thousand, five hundred nine".