1740668921 has 2 divisors, whose sum is σ = 1740668922. Its totient is φ = 1740668920.

The previous prime is 1740668903. The next prime is 1740668927. The reversal of 1740668921 is 1298660471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1279063696 + 461605225 = 35764^2 + 21485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1740668921 - 2¹⁰ = 1740667897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1740668927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 870334460 + 870334461.

It is an arithmetic number, because the mean of its divisors is an integer number (870334461).

Almost surely, 2^1740668921 is an apocalyptic number.

It is an amenable number.

1740668921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1740668921 is an equidigital number, since it uses as much as digits as its factorization.

1740668921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 1740668921 is about 41721.3245355418. The cubic root of 1740668921 is about 1202.9254827649.

The spelling of 1740668921 in words is "one billion, seven hundred forty million, six hundred sixty-eight thousand, nine hundred twenty-one".