380917721 has 2 divisors, whose sum is σ = 380917722. Its totient is φ = 380917720.

The previous prime is 380917709. The next prime is 380917727. The reversal of 380917721 is 127719083.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270142096 + 110775625 = 16436^2 + 10525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-380917721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (380917727) 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 as a sum of consecutive naturals, namely, 190458860 + 190458861.

It is an arithmetic number, because the mean of its divisors is an integer number (190458861).

Almost surely, 2^380917721 is an apocalyptic number.

It is an amenable number.

380917721 is a deficient number, since it is larger than the sum of its proper divisors (1).

380917721 is an equidigital number, since it uses as much as digits as its factorization.

380917721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 380917721 is about 19517.1135417100. The cubic root of 380917721 is about 724.8982630132.

The spelling of 380917721 in words is "three hundred eighty million, nine hundred seventeen thousand, seven hundred twenty-one".