380656665 has 40 divisors (see below), whose sum is σ = 684632520. Its totient is φ = 202341888.

The previous prime is 380656663. The next prime is 380656699. The reversal of 380656665 is 566656083.

It can be written as a sum of positive squares in 4 ways, for example, as 26501904 + 354154761 = 5148^2 + 18819^2 .

It is not a de Polignac number, because 380656665 - 2¹ = 380656663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 380656665.

It is not an unprimeable number, because it can be changed into a prime (380656663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 135091 + ... + 137879.

It is an arithmetic number, because the mean of its divisors is an integer number (17115813).

Almost surely, 2^380656665 is an apocalyptic number.

It is an amenable number.

380656665 is a deficient number, since it is larger than the sum of its proper divisors (303975855).

380656665 is a wasteful number, since it uses less digits than its factorization.

380656665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143 (or 3134 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 380656665 is about 19510.4245212655. The cubic root of 380656665 is about 724.7326259410.

The spelling of 380656665 in words is "three hundred eighty million, six hundred fifty-six thousand, six hundred sixty-five".