638241 has 8 divisors (see below), whose sum is σ = 862080. Its totient is φ = 419952.

The previous prime is 638233. The next prime is 638263. The reversal of 638241 is 142836.

It is a happy number.

638241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 638241 - 2³ = 638233 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (638201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (107760).

2⁶³⁸²⁴¹ is an apocalyptic number.

It is an amenable number.

638241 is a deficient number, since it is larger than the sum of its proper divisors (223839).

638241 is a wasteful number, since it uses less digits than its factorization.

638241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775.

The product of its digits is 1152, while the sum is 24.

The square root of 638241 is about 798.8998685693. The cubic root of 638241 is about 86.0983641054.

The spelling of 638241 in words is "six hundred thirty-eight thousand, two hundred forty-one".