638753 has 4 divisors (see below), whose sum is σ = 646020. Its totient is φ = 631488.

The previous prime is 638719. The next prime is 638767. The reversal of 638753 is 357836.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 380689 + 258064 = 617^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 638753 - 2⁶ = 638689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638453) 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 3 ways as a sum of consecutive naturals, for example, 3500 + ... + 3677.

It is an arithmetic number, because the mean of its divisors is an integer number (161505).

2⁶³⁸⁷⁵³ is an apocalyptic number.

It is an amenable number.

638753 is a deficient number, since it is larger than the sum of its proper divisors (7267).

638753 is an equidigital number, since it uses as much as digits as its factorization.

638753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266.

The product of its digits is 15120, while the sum is 32.

The square root of 638753 is about 799.2202449888. The cubic root of 638753 is about 86.1213807924.

The spelling of 638753 in words is "six hundred thirty-eight thousand, seven hundred fifty-three".