638632373 has 2 divisors, whose sum is σ = 638632374. Its totient is φ = 638632372.

The previous prime is 638632361. The next prime is 638632411. The reversal of 638632373 is 373236836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354305329 + 284327044 = 18823^2 + 16862^2 .

It is a cyclic number.

It is not a de Polignac number, because 638632373 - 2¹⁰ = 638631349 is a prime.

It is a super-2 number, since 2×638632373² = 815702615687222258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638632373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638632273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319316186 + 319316187.

It is an arithmetic number, because the mean of its divisors is an integer number (319316187).

Almost surely, 2^638632373 is an apocalyptic number.

It is an amenable number.

638632373 is a deficient number, since it is larger than the sum of its proper divisors (1).

638632373 is an equidigital number, since it uses as much as digits as its factorization.

638632373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 41.

The square root of 638632373 is about 25271.1767236906. The cubic root of 638632373 is about 861.1595917774.

The spelling of 638632373 in words is "six hundred thirty-eight million, six hundred thirty-two thousand, three hundred seventy-three".