638299 has 4 divisors (see below), whose sum is σ = 675864. Its totient is φ = 600736.

The previous prime is 638269. The next prime is 638303. The reversal of 638299 is 992836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638299 - 2⁷ = 638171 is a prime.

It is a super-2 number, since 2×638299² = 814851226802, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (638269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18757 + ... + 18790.

It is an arithmetic number, because the mean of its divisors is an integer number (168966).

2⁶³⁸²⁹⁹ is an apocalyptic number.

638299 is a deficient number, since it is larger than the sum of its proper divisors (37565).

638299 is a wasteful number, since it uses less digits than its factorization.

638299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37564.

The product of its digits is 23328, while the sum is 37.

The square root of 638299 is about 798.9361676630. The cubic root of 638299 is about 86.1009720825.

The spelling of 638299 in words is "six hundred thirty-eight thousand, two hundred ninety-nine".