638253 has 32 divisors (see below), whose sum is σ = 1182720. Its totient is φ = 330480.

The previous prime is 638233. The next prime is 638263. The reversal of 638253 is 352836.

638253 is a `hidden beast` number, since 638 + 25 + 3 = 666.

It is not a de Polignac number, because 638253 - 2¹⁰ = 637229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 1926 + ... + 2232.

It is an arithmetic number, because the mean of its divisors is an integer number (36960).

2⁶³⁸²⁵³ is an apocalyptic number.

638253 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

638253 is a deficient number, since it is larger than the sum of its proper divisors (544467).

638253 is a wasteful number, since it uses less digits than its factorization.

638253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 328 counting only the distinct ones).

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

The square root of 638253 is about 798.9073788619. The cubic root of 638253 is about 86.0989036998.

The spelling of 638253 in words is "six hundred thirty-eight thousand, two hundred fifty-three".