638093 has 4 divisors (see below), whose sum is σ = 646908. Its totient is φ = 629280.

The previous prime is 638081. The next prime is 638117. The reversal of 638093 is 390836.

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 232324 + 405769 = 482^2 + 637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638093 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 (638023) 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, 4298 + ... + 4443.

It is an arithmetic number, because the mean of its divisors is an integer number (161727).

2⁶³⁸⁰⁹³ is an apocalyptic number.

It is an amenable number.

638093 is a deficient number, since it is larger than the sum of its proper divisors (8815).

638093 is an equidigital number, since it uses as much as digits as its factorization.

638093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8814.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 638093 is about 798.8072358210. The cubic root of 638093 is about 86.0917085510.

The spelling of 638093 in words is "six hundred thirty-eight thousand, ninety-three".