638754 has 16 divisors (see below), whose sum is σ = 1321920. Its totient is φ = 205520.

The previous prime is 638719. The next prime is 638767. The reversal of 638754 is 457836.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1662 + ... + 2009.

It is an arithmetic number, because the mean of its divisors is an integer number (82620).

2⁶³⁸⁷⁵⁴ is an apocalyptic number.

638754 is an abundant number, since it is smaller than the sum of its proper divisors (683166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638754 is a wasteful number, since it uses less digits than its factorization.

638754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705.

The product of its digits is 20160, while the sum is 33.

The square root of 638754 is about 799.2208705984. The cubic root of 638754 is about 86.1214257348.

It can be divided in two parts, 6387 and 54, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 638754 in words is "six hundred thirty-eight thousand, seven hundred fifty-four".