638349 has 8 divisors (see below), whose sum is σ = 854880. Its totient is φ = 423696.

The previous prime is 638347. The next prime is 638359. The reversal of 638349 is 943836.

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

It is not a de Polignac number, because 638349 - 2¹ = 638347 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894 + ... + 1440.

It is an arithmetic number, because the mean of its divisors is an integer number (106860).

2⁶³⁸³⁴⁹ is an apocalyptic number.

It is an amenable number.

638349 is a deficient number, since it is larger than the sum of its proper divisors (216531).

638349 is a wasteful number, since it uses less digits than its factorization.

638349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939.

The product of its digits is 15552, while the sum is 33.

The square root of 638349 is about 798.9674586615. The cubic root of 638349 is about 86.1032202119.

The spelling of 638349 in words is "six hundred thirty-eight thousand, three hundred forty-nine".