639822403 has 4 divisors (see below), whose sum is σ = 697988088. Its totient is φ = 581656720.

The previous prime is 639822401. The next prime is 639822437. The reversal of 639822403 is 304228936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 639822403 - 2¹ = 639822401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639822401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29082826 + ... + 29082847.

It is an arithmetic number, because the mean of its divisors is an integer number (174497022).

Almost surely, 2^639822403 is an apocalyptic number.

639822403 is a deficient number, since it is larger than the sum of its proper divisors (58165685).

639822403 is a wasteful number, since it uses less digits than its factorization.

639822403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58165684.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 639822403 is about 25294.7109688962. The cubic root of 639822403 is about 861.6941559013.

The spelling of 639822403 in words is "six hundred thirty-nine million, eight hundred twenty-two thousand, four hundred three".