638373473 has 2 divisors, whose sum is σ = 638373474. Its totient is φ = 638373472.

The previous prime is 638373467. The next prime is 638373523. The reversal of 638373473 is 374373836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359216209 + 279157264 = 18953^2 + 16708^2 .

It is a cyclic number.

It is not a de Polignac number, because 638373473 - 2¹² = 638369377 is a prime.

It is not a weakly prime, because it can be changed into another prime (638373413) 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 as a sum of consecutive naturals, namely, 319186736 + 319186737.

It is an arithmetic number, because the mean of its divisors is an integer number (319186737).

Almost surely, 2^638373473 is an apocalyptic number.

It is an amenable number.

638373473 is a deficient number, since it is larger than the sum of its proper divisors (1).

638373473 is an equidigital number, since it uses as much as digits as its factorization.

638373473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 44.

The square root of 638373473 is about 25266.0537678522. The cubic root of 638373473 is about 861.0432053853.

The spelling of 638373473 in words is "six hundred thirty-eight million, three hundred seventy-three thousand, four hundred seventy-three".