639179346 has 64 divisors (see below), whose sum is σ = 1405264896. Its totient is φ = 192628800.

The previous prime is 639179341. The next prime is 639179351. The reversal of 639179346 is 643971936.

It is an interprime number because it is at equal distance from previous prime (639179341) and next prime (639179351).

It is a junction number, because it is equal to n+sod(n) for n = 639179295 and 639179304.

It is not an unprimeable number, because it can be changed into a prime (639179341) 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, 1168245 + ... + 1168791.

It is an arithmetic number, because the mean of its divisors is an integer number (21957264).

Almost surely, 2^639179346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639179346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (702632448).

639179346 is an abundant number, since it is smaller than the sum of its proper divisors (766085550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639179346 is a wasteful number, since it uses less digits than its factorization.

639179346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847.

The product of its digits is 734832, while the sum is 48.

The square root of 639179346 is about 25281.9964797086. The cubic root of 639179346 is about 861.4053756607.

The spelling of 639179346 in words is "six hundred thirty-nine million, one hundred seventy-nine thousand, three hundred forty-six".