639196373 has 2 divisors, whose sum is σ = 639196374. Its totient is φ = 639196372.

The previous prime is 639196367. The next prime is 639196387. The reversal of 639196373 is 373691936.

639196373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617870449 + 21325924 = 24857^2 + 4618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639196373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639196343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319598186 + 319598187.

It is an arithmetic number, because the mean of its divisors is an integer number (319598187).

Almost surely, 2^639196373 is an apocalyptic number.

It is an amenable number.

639196373 is a deficient number, since it is larger than the sum of its proper divisors (1).

639196373 is an equidigital number, since it uses as much as digits as its factorization.

639196373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 47.

The square root of 639196373 is about 25282.3332190682. Note that the first 3 decimals coincide. The cubic root of 639196373 is about 861.4130245411.

The spelling of 639196373 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, three hundred seventy-three".