646389117 has 12 divisors (see below), whose sum is σ = 1018552704. Its totient is φ = 391750920.

The previous prime is 646389109. The next prime is 646389127. The reversal of 646389117 is 711983646.

It is a happy number.

646389117 is a `hidden beast` number, since 6 + 4 + 638 + 9 + 1 + 1 + 7 = 666.

It is not a de Polignac number, because 646389117 - 2³ = 646389109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646389127) 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 11 ways as a sum of consecutive naturals, for example, 3264493 + ... + 3264690.

It is an arithmetic number, because the mean of its divisors is an integer number (84879392).

Almost surely, 2^646389117 is an apocalyptic number.

It is an amenable number.

646389117 is a deficient number, since it is larger than the sum of its proper divisors (372163587).

646389117 is a wasteful number, since it uses less digits than its factorization.

646389117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6529200 (or 6529197 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 646389117 is about 25424.1837037101. The cubic root of 646389117 is about 864.6320807149.

The spelling of 646389117 in words is "six hundred forty-six million, three hundred eighty-nine thousand, one hundred seventeen".