6388138 has 4 divisors (see below), whose sum is σ = 9582210. Its totient is φ = 3194068.

The previous prime is 6388121. The next prime is 6388189. The reversal of 6388138 is 8318836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5184729 + 1203409 = 2277^2 + 1097^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6388097 and 6388106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597033 + ... + 1597036.

Almost surely, 2^6388138 is an apocalyptic number.

6388138 is a deficient number, since it is larger than the sum of its proper divisors (3194072).

6388138 is a wasteful number, since it uses less digits than its factorization.

6388138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194071.

The product of its digits is 27648, while the sum is 37.

The square root of 6388138 is about 2527.4766072112. The cubic root of 6388138 is about 185.5487771411.

The spelling of 6388138 in words is "six million, three hundred eighty-eight thousand, one hundred thirty-eight".