638199 has 10 divisors (see below), whose sum is σ = 953480. Its totient is φ = 425412.

The previous prime is 638179. The next prime is 638201. The reversal of 638199 is 991836.

638199 is a `hidden beast` number, since 638 + 19 + 9 = 666.

It is not a de Polignac number, because 638199 - 2¹² = 634103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638159) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3859 + ... + 4020.

It is an arithmetic number, because the mean of its divisors is an integer number (95348).

2⁶³⁸¹⁹⁹ is an apocalyptic number.

638199 is a deficient number, since it is larger than the sum of its proper divisors (315281).

638199 is an equidigital number, since it uses as much as digits as its factorization.

638199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891 (or 7882 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 638199 is about 798.8735819890. The cubic root of 638199 is about 86.0964754716.

The spelling of 638199 in words is "six hundred thirty-eight thousand, one hundred ninety-nine".