38661565 has 16 divisors (see below), whose sum is σ = 48013056. Its totient is φ = 29865600.

The previous prime is 38661563. The next prime is 38661569. The reversal of 38661565 is 56516683.

It is not a de Polignac number, because 38661565 - 2¹ = 38661563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38661563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20200 + ... + 22030.

It is an arithmetic number, because the mean of its divisors is an integer number (3000816).

Almost surely, 2^38661565 is an apocalyptic number.

It is an amenable number.

38661565 is a deficient number, since it is larger than the sum of its proper divisors (9351491).

38661565 is a wasteful number, since it uses less digits than its factorization.

38661565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its digits is 129600, while the sum is 40.

The square root of 38661565 is about 6217.8424714687. The cubic root of 38661565 is about 338.1373489157.

The spelling of 38661565 in words is "thirty-eight million, six hundred sixty-one thousand, five hundred sixty-five".