638355 has 8 divisors (see below), whose sum is σ = 1021392. Its totient is φ = 340448.

The previous prime is 638347. The next prime is 638359. The reversal of 638355 is 553836.

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

It is a cyclic number.

It is not a de Polignac number, because 638355 - 2³ = 638347 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (638359) 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, 21264 + ... + 21293.

It is an arithmetic number, because the mean of its divisors is an integer number (127674).

2⁶³⁸³⁵⁵ is an apocalyptic number.

638355 is a deficient number, since it is larger than the sum of its proper divisors (383037).

638355 is a wasteful number, since it uses less digits than its factorization.

638355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42565.

The product of its digits is 10800, while the sum is 30.

The square root of 638355 is about 798.9712134990. The cubic root of 638355 is about 86.1034899795.

The spelling of 638355 in words is "six hundred thirty-eight thousand, three hundred fifty-five".