39668565 has 32 divisors (see below), whose sum is σ = 68155776. Its totient is φ = 19630080.

The previous prime is 39668543. The next prime is 39668567. The reversal of 39668565 is 56586693.

It is not a de Polignac number, because 39668565 - 2¹⁴ = 39652181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39668567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17550 + ... + 19680.

It is an arithmetic number, because the mean of its divisors is an integer number (2129868).

Almost surely, 2^39668565 is an apocalyptic number.

It is an amenable number.

39668565 is a deficient number, since it is larger than the sum of its proper divisors (28487211).

39668565 is a wasteful number, since it uses less digits than its factorization.

39668565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229.

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

The square root of 39668565 is about 6298.2985797753. The cubic root of 39668565 is about 341.0479919152.

The spelling of 39668565 in words is "thirty-nine million, six hundred sixty-eight thousand, five hundred sixty-five".