380665321 has 4 divisors (see below), whose sum is σ = 381413700. Its totient is φ = 379916944.

The previous prime is 380665319. The next prime is 380665331. The reversal of 380665321 is 123566083.

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 108910096 + 271755225 = 10436^2 + 16485^2 .

It is a cyclic number.

It is not a de Polignac number, because 380665321 - 2¹ = 380665319 is a prime.

It is a super-2 number, since 2×380665321² = 289812173224066082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (380665301) 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 3 ways as a sum of consecutive naturals, for example, 373426 + ... + 374443.

It is an arithmetic number, because the mean of its divisors is an integer number (95353425).

Almost surely, 2^380665321 is an apocalyptic number.

It is an amenable number.

380665321 is a deficient number, since it is larger than the sum of its proper divisors (748379).

380665321 is an equidigital number, since it uses as much as digits as its factorization.

380665321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748378.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 380665321 is about 19510.6463501341. The cubic root of 380665321 is about 724.7381192886.

The spelling of 380665321 in words is "three hundred eighty million, six hundred sixty-five thousand, three hundred twenty-one".