38665638 has 24 divisors (see below), whose sum is σ = 91391976. Its totient is φ = 11716800.

The previous prime is 38665621. The next prime is 38665639. The reversal of 38665638 is 83656683.

38665638 is a `hidden beast` number, since 3 + 8 + 6 + 6 + 5 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 38665593 and 38665602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38665639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97443 + ... + 97838.

It is an arithmetic number, because the mean of its divisors is an integer number (3807999).

Almost surely, 2^38665638 is an apocalyptic number.

38665638 is an abundant number, since it is smaller than the sum of its proper divisors (52726338).

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

38665638 is a wasteful number, since it uses less digits than its factorization.

38665638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195300 (or 195297 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 38665638 is about 6218.1699880270. The cubic root of 38665638 is about 338.1492227673.

The spelling of 38665638 in words is "thirty-eight million, six hundred sixty-five thousand, six hundred thirty-eight".