384591665 has 4 divisors (see below), whose sum is σ = 461510004. Its totient is φ = 307673328.

The previous prime is 384591661. The next prime is 384591689. The reversal of 384591665 is 566195483.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 294740224 + 89851441 = 17168^2 + 9479^2 .

It is a cyclic number.

It is not a de Polignac number, because 384591665 - 2² = 384591661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384591661) 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, 38459162 + ... + 38459171.

It is an arithmetic number, because the mean of its divisors is an integer number (115377501).

Almost surely, 2^384591665 is an apocalyptic number.

It is an amenable number.

384591665 is a deficient number, since it is larger than the sum of its proper divisors (76918339).

384591665 is an equidigital number, since it uses as much as digits as its factorization.

384591665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76918338.

The product of its digits is 777600, while the sum is 47.

The square root of 384591665 is about 19611.0087705860. The cubic root of 384591665 is about 727.2213534331.

The spelling of 384591665 in words is "three hundred eighty-four million, five hundred ninety-one thousand, six hundred sixty-five".