638623395 has 12 divisors (see below), whose sum is σ = 1106947296. Its totient is φ = 340599120.

The previous prime is 638623393. The next prime is 638623423. The reversal of 638623395 is 593326836.

638623395 is a `hidden beast` number, since 638 + 6 + 2 + 3 + 3 + 9 + 5 = 666.

It is not a de Polignac number, because 638623395 - 2¹ = 638623393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14191631 = 638623395 / (6 + 3 + 8 + 6 + 2 + 3 + 3 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 638623395.

It is not an unprimeable number, because it can be changed into a prime (638623393) 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 11 ways as a sum of consecutive naturals, for example, 7095771 + ... + 7095860.

It is an arithmetic number, because the mean of its divisors is an integer number (92245608).

Almost surely, 2^638623395 is an apocalyptic number.

638623395 is a deficient number, since it is larger than the sum of its proper divisors (468323901).

638623395 is a wasteful number, since it uses less digits than its factorization.

638623395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191642 (or 14191639 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 638623395 is about 25270.9990898658. Note that the first 3 decimals coincide. The cubic root of 638623395 is about 861.1555563170.

The spelling of 638623395 in words is "six hundred thirty-eight million, six hundred twenty-three thousand, three hundred ninety-five".