639841202 has 32 divisors (see below), whose sum is σ = 1288635264. Its totient is φ = 230112000.

The previous prime is 639841201. The next prime is 639841211. The reversal of 639841202 is 202148936.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (639841201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157799 + ... + 161802.

It is an arithmetic number, because the mean of its divisors is an integer number (40269852).

Almost surely, 2^639841202 is an apocalyptic number.

639841202 is an abundant number, since it is smaller than the sum of its proper divisors (648794062).

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

639841202 is a wasteful number, since it uses less digits than its factorization.

639841202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319634.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 639841202 is about 25295.0825655897. The cubic root of 639841202 is about 861.7025951337.

The spelling of 639841202 in words is "six hundred thirty-nine million, eight hundred forty-one thousand, two hundred two".