420555987 has 6 divisors (see below), whose sum is σ = 607469772. Its totient is φ = 280370652.

The previous prime is 420555977. The next prime is 420556043. The reversal of 420555987 is 789555024.

420555987 is a `hidden beast` number, since 4 + 2 + 0 + 55 + 598 + 7 = 666.

It is not a de Polignac number, because 420555987 - 2⁸ = 420555731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420555917) 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 5 ways as a sum of consecutive naturals, for example, 23364213 + ... + 23364230.

It is an arithmetic number, because the mean of its divisors is an integer number (101244962).

Almost surely, 2^420555987 is an apocalyptic number.

420555987 is a deficient number, since it is larger than the sum of its proper divisors (186913785).

420555987 is a wasteful number, since it uses less digits than its factorization.

420555987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46728449 (or 46728446 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The square root of 420555987 is about 20507.4617395718. The cubic root of 420555987 is about 749.2175466395.

The spelling of 420555987 in words is "four hundred twenty million, five hundred fifty-five thousand, nine hundred eighty-seven".