638304371 has 2 divisors, whose sum is σ = 638304372. Its totient is φ = 638304370.

The previous prime is 638304367. The next prime is 638304379. The reversal of 638304371 is 173403836.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638304371 - 2² = 638304367 is a prime.

It is not a weakly prime, because it can be changed into another prime (638304379) 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, 319152185 + 319152186.

It is an arithmetic number, because the mean of its divisors is an integer number (319152186).

Almost surely, 2^638304371 is an apocalyptic number.

638304371 is a deficient number, since it is larger than the sum of its proper divisors (1).

638304371 is an equidigital number, since it uses as much as digits as its factorization.

638304371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 638304371 is about 25264.6862438464. The cubic root of 638304371 is about 861.0121358222.

The spelling of 638304371 in words is "six hundred thirty-eight million, three hundred four thousand, three hundred seventy-one".