638235 has 24 divisors (see below), whose sum is σ = 1192464. Its totient is φ = 313920.

The previous prime is 638233. The next prime is 638263. The reversal of 638235 is 532836.

638235 is a `hidden beast` number, since 638 + 23 + 5 = 666.

It is not a de Polignac number, because 638235 - 2¹ = 638233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638199 and 638208.

It is not an unprimeable number, because it can be changed into a prime (638233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (49686).

2⁶³⁸²³⁵ is an apocalyptic number.

638235 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

638235 is a deficient number, since it is larger than the sum of its proper divisors (554229).

638235 is a wasteful number, since it uses less digits than its factorization.

638235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1112 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 638235 is about 798.8961133965. The cubic root of 638235 is about 86.0980943056.

The spelling of 638235 in words is "six hundred thirty-eight thousand, two hundred thirty-five".