380190721 has 2 divisors, whose sum is σ = 380190722. Its totient is φ = 380190720.

The previous prime is 380190719. The next prime is 380190761. The reversal of 380190721 is 127091083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347300496 + 32890225 = 18636^2 + 5735^2 .

It is a cyclic number.

It is not a de Polignac number, because 380190721 - 2¹ = 380190719 is a prime.

Together with 380190719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (380190761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190095360 + 190095361.

It is an arithmetic number, because the mean of its divisors is an integer number (190095361).

Almost surely, 2^380190721 is an apocalyptic number.

It is an amenable number.

380190721 is a deficient number, since it is larger than the sum of its proper divisors (1).

380190721 is an equidigital number, since it uses as much as digits as its factorization.

380190721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 380190721 is about 19498.4799663974. The cubic root of 380190721 is about 724.4368014489.

The spelling of 380190721 in words is "three hundred eighty million, one hundred ninety thousand, seven hundred twenty-one".