639464943 has 8 divisors (see below), whose sum is σ = 918206128. Its totient is φ = 393516864.

The previous prime is 639464941. The next prime is 639464953. The reversal of 639464943 is 349464936.

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

It is not a de Polignac number, because 639464943 - 2¹ = 639464941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639464892 and 639464901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639464941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8198230 + ... + 8198307.

It is an arithmetic number, because the mean of its divisors is an integer number (114775766).

Almost surely, 2^639464943 is an apocalyptic number.

639464943 is a deficient number, since it is larger than the sum of its proper divisors (278741185).

639464943 is a wasteful number, since it uses less digits than its factorization.

639464943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16396553.

The product of its digits is 1679616, while the sum is 48.

The square root of 639464943 is about 25287.6440776914. The cubic root of 639464943 is about 861.5336537725.

The spelling of 639464943 in words is "six hundred thirty-nine million, four hundred sixty-four thousand, nine hundred forty-three".