420317784639 has 32 divisors (see below), whose sum is σ = 659404152000. Its totient is φ = 263695951872.

The previous prime is 420317784613. The next prime is 420317784641. The reversal of 420317784639 is 936487713024.

420317784639 is a `hidden beast` number, since 4 + 2 + 0 + 3 + 177 + 8 + 463 + 9 = 666.

It is not a de Polignac number, because 420317784639 - 2⁷ = 420317784511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420317784659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3935557 + ... + 4040945.

It is an arithmetic number, because the mean of its divisors is an integer number (20606379750).

Almost surely, 2^420317784639 is an apocalyptic number.

420317784639 is a deficient number, since it is larger than the sum of its proper divisors (239086367361).

420317784639 is a wasteful number, since it uses less digits than its factorization.

420317784639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114104 (or 114098 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 420317784639 in words is "four hundred twenty billion, three hundred seventeen million, seven hundred eighty-four thousand, six hundred thirty-nine".