638200093 has 2 divisors, whose sum is σ = 638200094. Its totient is φ = 638200092.

The previous prime is 638200039. The next prime is 638200103. The reversal of 638200093 is 390002836.

It is a happy number.

Together with previous prime (638200039) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612414009 + 25786084 = 24747^2 + 5078^2 .

It is a cyclic number.

It is not a de Polignac number, because 638200093 - 2²¹ = 636102941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638200033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319100046 + 319100047.

It is an arithmetic number, because the mean of its divisors is an integer number (319100047).

Almost surely, 2^638200093 is an apocalyptic number.

It is an amenable number.

638200093 is a deficient number, since it is larger than the sum of its proper divisors (1).

638200093 is an equidigital number, since it uses as much as digits as its factorization.

638200093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 638200093 is about 25262.6224489858. The cubic root of 638200093 is about 860.9652462205.

The spelling of 638200093 in words is "six hundred thirty-eight million, two hundred thousand, ninety-three".