638574 has 16 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 209720.

The previous prime is 638567. The next prime is 638581. The reversal of 638574 is 475836.

It is an interprime number because it is at equal distance from previous prime (638567) and next prime (638581).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638574.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (81000).

2⁶³⁸⁵⁷⁴ is an apocalyptic number.

638574 is an abundant number, since it is smaller than the sum of its proper divisors (657426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638574 is a wasteful number, since it uses less digits than its factorization.

638574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575.

The product of its digits is 20160, while the sum is 33.

The square root of 638574 is about 799.1082529920. The cubic root of 638574 is about 86.1133353416.

The spelling of 638574 in words is "six hundred thirty-eight thousand, five hundred seventy-four".