420860287 has 4 divisors (see below), whose sum is σ = 423063936. Its totient is φ = 418656640.

The previous prime is 420860249. The next prime is 420860291. The reversal of 420860287 is 782068024.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420860287 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 (420860087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101538 + ... + 1101919.

It is an arithmetic number, because the mean of its divisors is an integer number (105765984).

Almost surely, 2^420860287 is an apocalyptic number.

420860287 is a deficient number, since it is larger than the sum of its proper divisors (2203649).

420860287 is a wasteful number, since it uses less digits than its factorization.

420860287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203648.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 420860287 is about 20514.8796486843. The cubic root of 420860287 is about 749.3982058468.

The spelling of 420860287 in words is "four hundred twenty million, eight hundred sixty thousand, two hundred eighty-seven".