646389115 has 8 divisors (see below), whose sum is σ = 793705968. Its totient is φ = 505085280.

The previous prime is 646389109. The next prime is 646389127. The reversal of 646389115 is 511983646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-646389115 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1503016 + ... + 1503445.

It is an arithmetic number, because the mean of its divisors is an integer number (99213246).

Almost surely, 2^646389115 is an apocalyptic number.

646389115 is a deficient number, since it is larger than the sum of its proper divisors (147316853).

646389115 is a wasteful number, since it uses less digits than its factorization.

646389115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006509.

The product of its digits is 155520, while the sum is 43.

The square root of 646389115 is about 25424.1836643775. The cubic root of 646389115 is about 864.6320798231.

The spelling of 646389115 in words is "six hundred forty-six million, three hundred eighty-nine thousand, one hundred fifteen".