38640856 has 8 divisors (see below), whose sum is σ = 72451620. Its totient is φ = 19320424.

The previous prime is 38640853. The next prime is 38640857. The reversal of 38640856 is 65804683.

38640856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38640853) 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 as a sum of consecutive naturals, namely, 2415046 + ... + 2415061.

Almost surely, 2^38640856 is an apocalyptic number.

It is an amenable number.

38640856 is a deficient number, since it is larger than the sum of its proper divisors (33810764).

38640856 is a wasteful number, since it uses less digits than its factorization.

38640856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830113 (or 4830109 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 38640856 is about 6216.1769601581. The cubic root of 38640856 is about 338.0769639052.

The spelling of 38640856 in words is "thirty-eight million, six hundred forty thousand, eight hundred fifty-six".