638013 has 4 divisors (see below), whose sum is σ = 850688. Its totient is φ = 425340.

The previous prime is 637939. The next prime is 638023. The reversal of 638013 is 310836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 638013 - 2¹⁴ = 621629 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106333 + ... + 106338.

It is an arithmetic number, because the mean of its divisors is an integer number (212672).

2⁶³⁸⁰¹³ is an apocalyptic number.

It is an amenable number.

638013 is a deficient number, since it is larger than the sum of its proper divisors (212675).

638013 is a wasteful number, since it uses less digits than its factorization.

638013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212674.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 638013 is about 798.7571595923. The cubic root of 638013 is about 86.0881105256.

Adding to 638013 its reverse (310836), we get a palindrome (948849).

The spelling of 638013 in words is "six hundred thirty-eight thousand, thirteen".