638524 has 6 divisors (see below), whose sum is σ = 1117424. Its totient is φ = 319260.

The previous prime is 638501. The next prime is 638527. The reversal of 638524 is 425836.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6² + 3⁹ + 5⁷ + 8 + 2¹⁹ + 4⁷ .

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 638492 and 638501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79812 + ... + 79819.

2⁶³⁸⁵²⁴ is an apocalyptic number.

It is an amenable number.

638524 is a deficient number, since it is larger than the sum of its proper divisors (478900).

638524 is a wasteful number, since it uses less digits than its factorization.

638524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159635 (or 159633 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 638524 is about 799.0769675069. The cubic root of 638524 is about 86.1110877404. Note that the first 3 decimals are identical.

The spelling of 638524 in words is "six hundred thirty-eight thousand, five hundred twenty-four".