420782906 has 4 divisors (see below), whose sum is σ = 631174362. Its totient is φ = 210391452.

The previous prime is 420782899. The next prime is 420782917. The reversal of 420782906 is 609287024.

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., 420045025 + 737881 = 20495^2 + 859^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 420782906.

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, 105195725 + ... + 105195728.

Almost surely, 2^420782906 is an apocalyptic number.

420782906 is a deficient number, since it is larger than the sum of its proper divisors (210391456).

420782906 is a wasteful number, since it uses less digits than its factorization.

420782906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210391455.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 420782906 is about 20512.9935894301. The cubic root of 420782906 is about 749.3522739475.

The spelling of 420782906 in words is "four hundred twenty million, seven hundred eighty-two thousand, nine hundred six".