38971649 has 4 divisors (see below), whose sum is σ = 38989140. Its totient is φ = 38954160.

The previous prime is 38971577. The next prime is 38971651. The reversal of 38971649 is 94617983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94617983 = 31 ⋅3052193.

It can be written as a sum of positive squares in 2 ways, for example, as 20866624 + 18105025 = 4568^2 + 4255^2 .

It is a cyclic number.

It is not a de Polignac number, because 38971649 - 2⁸ = 38971393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38971949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4814 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (9747285).

Almost surely, 2^38971649 is an apocalyptic number.

It is an amenable number.

38971649 is a deficient number, since it is larger than the sum of its proper divisors (17491).

38971649 is a wasteful number, since it uses less digits than its factorization.

38971649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17490.

The product of its digits is 326592, while the sum is 47.

The square root of 38971649 is about 6242.7276890795. The cubic root of 38971649 is about 339.0389498208.

The spelling of 38971649 in words is "thirty-eight million, nine hundred seventy-one thousand, six hundred forty-nine".