420755287 has 16 divisors (see below), whose sum is σ = 469592640. Its totient is φ = 375112192.

The previous prime is 420755263. The next prime is 420755297. The reversal of 420755287 is 782557024.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420755287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420755227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18078 + ... + 34180.

It is an arithmetic number, because the mean of its divisors is an integer number (29349540).

Almost surely, 2^420755287 is an apocalyptic number.

420755287 is a deficient number, since it is larger than the sum of its proper divisors (48837353).

420755287 is a wasteful number, since it uses less digits than its factorization.

420755287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16202.

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 420755287 is about 20512.3203709380. The cubic root of 420755287 is about 749.3358784674.

The spelling of 420755287 in words is "four hundred twenty million, seven hundred fifty-five thousand, two hundred eighty-seven".