7638138 has 20 divisors (see below), whose sum is σ = 17115450. Its totient is φ = 2545992.

The previous prime is 7638089. The next prime is 7638143. The reversal of 7638138 is 8318367.

7638138 is a `hidden beast` number, since 7 + 638 + 13 + 8 = 666.

7638138 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7634169 + 3969 = 2763^2 + 63^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 23413 + ... + 23736.

Almost surely, 2^7638138 is an apocalyptic number.

7638138 is an abundant number, since it is smaller than the sum of its proper divisors (9477312).

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

7638138 is a wasteful number, since it uses less digits than its factorization.

7638138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47163 (or 47154 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 7638138 is about 2763.7181477133. The cubic root of 7638138 is about 196.9378384445.

It can be divided in two parts, 7638 and 138, that added together give a 5-th power (7776 = 6⁵).

The spelling of 7638138 in words is "seven million, six hundred thirty-eight thousand, one hundred thirty-eight".