639333340 has 12 divisors (see below), whose sum is σ = 1342600056. Its totient is φ = 255733328.

The previous prime is 639333319. The next prime is 639333347. The reversal of 639333340 is 43333936.

It is a junction number, because it is equal to n+sod(n) for n = 639333296 and 639333305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639333347) 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 3 ways as a sum of consecutive naturals, for example, 15983314 + ... + 15983353.

It is an arithmetic number, because the mean of its divisors is an integer number (111883338).

Almost surely, 2^639333340 is an apocalyptic number.

It is an amenable number.

639333340 is an abundant number, since it is smaller than the sum of its proper divisors (703266716).

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

639333340 is a wasteful number, since it uses less digits than its factorization.

639333340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31966676 (or 31966674 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 34.

The square root of 639333340 is about 25285.0418231808. The cubic root of 639333340 is about 861.4745480084.

The spelling of 639333340 in words is "six hundred thirty-nine million, three hundred thirty-three thousand, three hundred forty".