420890665 has 16 divisors (see below), whose sum is σ = 556573248. Its totient is φ = 303581376.

The previous prime is 420890653. The next prime is 420890669. The reversal of 420890665 is 566098024.

It is a happy number.

It is not a de Polignac number, because 420890665 - 2⁵ = 420890633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420890669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72499 + ... + 78088.

It is an arithmetic number, because the mean of its divisors is an integer number (34785828).

Almost surely, 2^420890665 is an apocalyptic number.

It is an amenable number.

420890665 is a deficient number, since it is larger than the sum of its proper divisors (135682583).

420890665 is a wasteful number, since it uses less digits than its factorization.

420890665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150648.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 420890665 is about 20515.6200247519. The cubic root of 420890665 is about 749.4162361146.

The spelling of 420890665 in words is "four hundred twenty million, eight hundred ninety thousand, six hundred sixty-five".