1382208721 has 2 divisors, whose sum is σ = 1382208722. Its totient is φ = 1382208720.

The previous prime is 1382208703. The next prime is 1382208739. The reversal of 1382208721 is 1278022831.

It is a balanced prime because it is at equal distance from previous prime (1382208703) and next prime (1382208739).

It can be written as a sum of positive squares in only one way, i.e., 1172103696 + 210105025 = 34236^2 + 14495^2 .

It is an emirp because it is prime and its reverse (1278022831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1382208721 - 2⁹ = 1382208209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1382208521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691104360 + 691104361.

It is an arithmetic number, because the mean of its divisors is an integer number (691104361).

Almost surely, 2^1382208721 is an apocalyptic number.

It is an amenable number.

1382208721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1382208721 is an equidigital number, since it uses as much as digits as its factorization.

1382208721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1382208721 is about 37178.0677416135. The cubic root of 1382208721 is about 1113.9299381560.

The spelling of 1382208721 in words is "one billion, three hundred eighty-two million, two hundred eight thousand, seven hundred twenty-one".