638499 has 8 divisors (see below), whose sum is σ = 855232. Its totient is φ = 423720.

The previous prime is 638489. The next prime is 638501. The reversal of 638499 is 994836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638499 - 2⁵ = 638467 is a prime.

It is a d-powerful number, because it can be written as 6 + 3⁷ + 4⁸ + 8⁵ + 9⁴ + 9⁶ .

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638499.

It is not an unprimeable number, because it can be changed into a prime (638459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672 + ... + 1314.

It is an arithmetic number, because the mean of its divisors is an integer number (106904).

2⁶³⁸⁴⁹⁹ is an apocalyptic number.

638499 is a deficient number, since it is larger than the sum of its proper divisors (216733).

638499 is a wasteful number, since it uses less digits than its factorization.

638499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977.

The product of its digits is 46656, while the sum is 39.

The square root of 638499 is about 799.0613243050. The cubic root of 638499 is about 86.1099638958.

The spelling of 638499 in words is "six hundred thirty-eight thousand, four hundred ninety-nine".