738841721 has 2 divisors, whose sum is σ = 738841722. Its totient is φ = 738841720.

The previous prime is 738841711. The next prime is 738841751. The reversal of 738841721 is 127148837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492351721 + 246490000 = 22189^2 + 15700^2 .

It is a cyclic number.

It is not a de Polignac number, because 738841721 - 2¹⁸ = 738579577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (738841711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369420860 + 369420861.

It is an arithmetic number, because the mean of its divisors is an integer number (369420861).

Almost surely, 2^738841721 is an apocalyptic number.

It is an amenable number.

738841721 is a deficient number, since it is larger than the sum of its proper divisors (1).

738841721 is an equidigital number, since it uses as much as digits as its factorization.

738841721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 41.

The square root of 738841721 is about 27181.6430886729. The cubic root of 738841721 is about 904.0320006064.

The spelling of 738841721 in words is "seven hundred thirty-eight million, eight hundred forty-one thousand, seven hundred twenty-one".