638884 has 6 divisors (see below), whose sum is σ = 1118054. Its totient is φ = 319440.

The previous prime is 638861. The next prime is 638893. The reversal of 638884 is 488836.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 108900 = 728^2 + 330^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79857 + ... + 79864.

2⁶³⁸⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

638884 is a deficient number, since it is larger than the sum of its proper divisors (479170).

638884 is a wasteful number, since it uses less digits than its factorization.

638884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159725 (or 159723 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 638884 is about 799.3021956682. The cubic root of 638884 is about 86.1272678513.

It can be divided in two parts, 63888 and 4, that multiplied together give a palindrome (255552).

The spelling of 638884 in words is "six hundred thirty-eight thousand, eight hundred eighty-four".