638461 has 4 divisors (see below), whose sum is σ = 640512. Its totient is φ = 636412.

The previous prime is 638459. The next prime is 638467. The reversal of 638461 is 164836.

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 a cyclic number.

It is not a de Polignac number, because 638461 - 2¹ = 638459 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638467) 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, 451 + ... + 1216.

It is an arithmetic number, because the mean of its divisors is an integer number (160128).

2⁶³⁸⁴⁶¹ is an apocalyptic number.

It is an amenable number.

638461 is a deficient number, since it is larger than the sum of its proper divisors (2051).

638461 is a wasteful number, since it uses less digits than its factorization.

638461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050.

The product of its digits is 3456, while the sum is 28.

The square root of 638461 is about 799.0375460515. The cubic root of 638461 is about 86.1082555958.

The spelling of 638461 in words is "six hundred thirty-eight thousand, four hundred sixty-one".