38628381 has 16 divisors (see below), whose sum is σ = 57028608. Its totient is φ = 23060400.

The previous prime is 38628347. The next prime is 38628397. The reversal of 38628381 is 18382683.

38628381 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 38628381 - 2¹³ = 38620189 is a prime.

It is a super-2 number, since 2×38628381² = 2984303637362322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38628341) 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 15 ways as a sum of consecutive naturals, for example, 6525 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (3564288).

Almost surely, 2^38628381 is an apocalyptic number.

It is an amenable number.

38628381 is a deficient number, since it is larger than the sum of its proper divisors (18400227).

38628381 is a wasteful number, since it uses less digits than its factorization.

38628381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17552.

The product of its digits is 55296, while the sum is 39.

The square root of 38628381 is about 6215.1734489071. The cubic root of 38628381 is about 338.0405778577.

The spelling of 38628381 in words is "thirty-eight million, six hundred twenty-eight thousand, three hundred eighty-one".