420755865 has 16 divisors (see below), whose sum is σ = 712810368. Its totient is φ = 211202816.

The previous prime is 420755861. The next prime is 420755873. The reversal of 420755865 is 568557024.

It is a cyclic number.

It is not a de Polignac number, because 420755865 - 2² = 420755861 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420755861) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 824757 + ... + 825266.

It is an arithmetic number, because the mean of its divisors is an integer number (44550648).

Almost surely, 2^420755865 is an apocalyptic number.

It is an amenable number.

420755865 is a deficient number, since it is larger than the sum of its proper divisors (292054503).

420755865 is a wasteful number, since it uses less digits than its factorization.

420755865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650048.

The product of its (nonzero) digits is 336000, while the sum is 42.

The square root of 420755865 is about 20512.3344600267. The cubic root of 420755865 is about 749.3362215932.

The spelling of 420755865 in words is "four hundred twenty million, seven hundred fifty-five thousand, eight hundred sixty-five".