638654 has 4 divisors (see below), whose sum is σ = 957984. Its totient is φ = 319326.

The previous prime is 638633. The next prime is 638663. The reversal of 638654 is 456836.

It is a semiprime because it is the product of two primes.

It is a d-powerful number, because it can be written as 6⁷ + 3⁴ + 6⁷ + 8³ + 5⁷ + 4³ .

It is a self number, because there is not a number n which added to its sum of digits gives 638654.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159662 + ... + 159665.

It is an arithmetic number, because the mean of its divisors is an integer number (239496).

2⁶³⁸⁶⁵⁴ is an apocalyptic number.

638654 is a deficient number, since it is larger than the sum of its proper divisors (319330).

638654 is a wasteful number, since it uses less digits than its factorization.

638654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319329.

The product of its digits is 17280, while the sum is 32.

The square root of 638654 is about 799.1583072208. The cubic root of 638654 is about 86.1169312596.

The spelling of 638654 in words is "six hundred thirty-eight thousand, six hundred fifty-four".