639822441 has 16 divisors (see below), whose sum is σ = 891601920. Its totient is φ = 407354640.

The previous prime is 639822439. The next prime is 639822451. The reversal of 639822441 is 144228936.

It is not a de Polignac number, because 639822441 - 2¹ = 639822439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639822441.

It is not an unprimeable number, because it can be changed into a prime (639822401) 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, 38436 + ... + 52506.

It is an arithmetic number, because the mean of its divisors is an integer number (55725120).

Almost surely, 2^639822441 is an apocalyptic number.

It is an amenable number.

639822441 is a deficient number, since it is larger than the sum of its proper divisors (251779479).

639822441 is a wasteful number, since it uses less digits than its factorization.

639822441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14756.

The product of its digits is 82944, while the sum is 39.

The square root of 639822441 is about 25294.7117200414. The cubic root of 639822441 is about 861.6941729604.

The spelling of 639822441 in words is "six hundred thirty-nine million, eight hundred twenty-two thousand, four hundred forty-one".