420330506 has 4 divisors (see below), whose sum is σ = 630495762. Its totient is φ = 210165252.

The previous prime is 420330473. The next prime is 420330511. The reversal of 420330506 is 605033024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 262602025 + 157728481 = 16205^2 + 12559^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 105082625 + ... + 105082628.

Almost surely, 2^420330506 is an apocalyptic number.

420330506 is a deficient number, since it is larger than the sum of its proper divisors (210165256).

420330506 is a wasteful number, since it uses less digits than its factorization.

420330506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210165255.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 420330506 is about 20501.9634669463. The cubic root of 420330506 is about 749.0836250950.

The spelling of 420330506 in words is "four hundred twenty million, three hundred thirty thousand, five hundred six".