38661381 has 20 divisors (see below), whose sum is σ = 63005184. Its totient is φ = 23430600.

The previous prime is 38661377. The next prime is 38661397. The reversal of 38661381 is 18316683.

38661381 is a `hidden beast` number, since 38 + 6 + 613 + 8 + 1 = 666.

38661381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38661381 - 2² = 38661377 is a prime.

It is a super-2 number, since 2×38661381² = 2989404761654322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38661341) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 20805 + ... + 22586.

Almost surely, 2^38661381 is an apocalyptic number.

It is an amenable number.

38661381 is a deficient number, since it is larger than the sum of its proper divisors (24343803).

38661381 is a wasteful number, since it uses less digits than its factorization.

38661381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43414 (or 43405 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 38661381 is about 6217.8276753220. The cubic root of 38661381 is about 338.1368124883.

The spelling of 38661381 in words is "thirty-eight million, six hundred sixty-one thousand, three hundred eighty-one".