1721920373 has 2 divisors, whose sum is σ = 1721920374. Its totient is φ = 1721920372.

The previous prime is 1721920357. The next prime is 1721920411. The reversal of 1721920373 is 3730291271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1412406724 + 309513649 = 37582^2 + 17593^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721920373 - 2⁴ = 1721920357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721920313) 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, 860960186 + 860960187.

It is an arithmetic number, because the mean of its divisors is an integer number (860960187).

Almost surely, 2^1721920373 is an apocalyptic number.

It is an amenable number.

1721920373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721920373 is an equidigital number, since it uses as much as digits as its factorization.

1721920373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 1721920373 is about 41496.0284003180. The cubic root of 1721920373 is about 1198.5910252411.

The spelling of 1721920373 in words is "one billion, seven hundred twenty-one million, nine hundred twenty thousand, three hundred seventy-three".