639362289 has 8 divisors (see below), whose sum is σ = 866458432. Its totient is φ = 419253840.

The previous prime is 639362201. The next prime is 639362309. The reversal of 639362289 is 982263936.

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

It is not a de Polignac number, because 639362289 - 2⁹ = 639361777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639362489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1746709 + ... + 1747074.

It is an arithmetic number, because the mean of its divisors is an integer number (108307304).

Almost surely, 2^639362289 is an apocalyptic number.

It is an amenable number.

639362289 is a deficient number, since it is larger than the sum of its proper divisors (227096143).

639362289 is a wasteful number, since it uses less digits than its factorization.

639362289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493847.

The product of its digits is 839808, while the sum is 48.

The square root of 639362289 is about 25285.6142697780. The cubic root of 639362289 is about 861.4875503285.

The spelling of 639362289 in words is "six hundred thirty-nine million, three hundred sixty-two thousand, two hundred eighty-nine".