638933 has 2 divisors, whose sum is σ = 638934. Its totient is φ = 638932.

The previous prime is 638923. The next prime is 638959. The reversal of 638933 is 339836.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 521284 + 117649 = 722^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 638933 - 2¹⁰ = 637909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319466 + 319467.

It is an arithmetic number, because the mean of its divisors is an integer number (319467).

2⁶³⁸⁹³³ is an apocalyptic number.

It is an amenable number.

638933 is a deficient number, since it is larger than the sum of its proper divisors (1).

638933 is an equidigital number, since it uses as much as digits as its factorization.

638933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 638933 is about 799.3328468166. The cubic root of 638933 is about 86.1294696742.

The spelling of 638933 in words is "six hundred thirty-eight thousand, nine hundred thirty-three".