638494 has 8 divisors (see below), whose sum is σ = 965448. Its totient is φ = 316680.

The previous prime is 638489. The next prime is 638501. The reversal of 638494 is 494836.

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

It is a super-3 number, since 3×638494³ = 780893335240373352, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

638494 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 957 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (120681).

2⁶³⁸⁴⁹⁴ is an apocalyptic number.

638494 is a deficient number, since it is larger than the sum of its proper divisors (326954).

638494 is a wasteful number, since it uses less digits than its factorization.

638494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570.

The product of its digits is 20736, while the sum is 34.

The square root of 638494 is about 799.0581956278. The cubic root of 638494 is about 86.1097391233.

The spelling of 638494 in words is "six hundred thirty-eight thousand, four hundred ninety-four".