420491947 has 4 divisors (see below), whose sum is σ = 420900040. Its totient is φ = 420083856.

The previous prime is 420491893. The next prime is 420491959. The reversal of 420491947 is 749194024.

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

It is a cyclic number.

It is not a de Polignac number, because 420491947 - 2¹¹ = 420489899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420491977) 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, 202497 + ... + 204562.

It is an arithmetic number, because the mean of its divisors is an integer number (105225010).

Almost surely, 2^420491947 is an apocalyptic number.

420491947 is a deficient number, since it is larger than the sum of its proper divisors (408093).

420491947 is a wasteful number, since it uses less digits than its factorization.

420491947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408092.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 420491947 is about 20505.9002972315. The cubic root of 420491947 is about 749.1795157719.

The spelling of 420491947 in words is "four hundred twenty million, four hundred ninety-one thousand, nine hundred forty-seven".