638386 has 8 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 273588.

The previous prime is 638371. The next prime is 638423. The reversal of 638386 is 683836.

638386 = T₂₃₆ + T₂₃₇ + ... + T₂₅₆.

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

It is a d-powerful number, because it can be written as 6³ + 3¹⁰ + 3¹² + 8³ + 8³ + 6⁶ .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22786 + ... + 22813.

It is an arithmetic number, because the mean of its divisors is an integer number (136800).

2⁶³⁸³⁸⁶ is an apocalyptic number.

638386 is a deficient number, since it is larger than the sum of its proper divisors (456014).

638386 is a wasteful number, since it uses less digits than its factorization.

638386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45608.

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

The square root of 638386 is about 798.9906132114. The cubic root of 638386 is about 86.1048837521.

It can be divided in two parts, 638 and 386, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 638386 in words is "six hundred thirty-eight thousand, three hundred eighty-six".