638673 has 16 divisors (see below), whose sum is σ = 1031040. Its totient is φ = 343296.

The previous prime is 638669. The next prime is 638689. The reversal of 638673 is 376836.

It is a happy number.

It is not a de Polignac number, because 638673 - 2² = 638669 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (638633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (64440).

2⁶³⁸⁶⁷³ is an apocalyptic number.

It is an amenable number.

638673 is a deficient number, since it is larger than the sum of its proper divisors (392367).

638673 is a wasteful number, since it uses less digits than its factorization.

638673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its digits is 18144, while the sum is 33.

The square root of 638673 is about 799.1701946394. The cubic root of 638673 is about 86.1177852460.

The spelling of 638673 in words is "six hundred thirty-eight thousand, six hundred seventy-three".