638373523 has 2 divisors, whose sum is σ = 638373524. Its totient is φ = 638373522.

The previous prime is 638373473. The next prime is 638373553. The reversal of 638373523 is 325373836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638373523 - 2⁹ = 638373011 is a prime.

It is not a weakly prime, because it can be changed into another prime (638373553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319186761 + 319186762.

It is an arithmetic number, because the mean of its divisors is an integer number (319186762).

Almost surely, 2^638373523 is an apocalyptic number.

638373523 is a deficient number, since it is larger than the sum of its proper divisors (1).

638373523 is an equidigital number, since it uses as much as digits as its factorization.

638373523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 40.

The square root of 638373523 is about 25266.0547573221. The cubic root of 638373523 is about 861.0432278654.

The spelling of 638373523 in words is "six hundred thirty-eight million, three hundred seventy-three thousand, five hundred twenty-three".