38966565 has 32 divisors (see below), whose sum is σ = 68544000. Its totient is φ = 18745920.

The previous prime is 38966561. The next prime is 38966573. The reversal of 38966565 is 56566983.

It is not a de Polignac number, because 38966565 - 2² = 38966561 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38966561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22086 + ... + 23784.

It is an arithmetic number, because the mean of its divisors is an integer number (2142000).

Almost surely, 2^38966565 is an apocalyptic number.

38966565 is the 5097-th pentagonal number.

It is an amenable number.

38966565 is a deficient number, since it is larger than the sum of its proper divisors (29577435).

38966565 is a wasteful number, since it uses less digits than its factorization.

38966565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857.

The product of its digits is 1166400, while the sum is 48.

The square root of 38966565 is about 6242.3204820003. The cubic root of 38966565 is about 339.0242062057.

The spelling of 38966565 in words is "thirty-eight million, nine hundred sixty-six thousand, five hundred sixty-five".