10398721 has 2 divisors, whose sum is σ = 10398722. Its totient is φ = 10398720.

The previous prime is 10398701. The next prime is 10398743. The reversal of 10398721 is 12789301.

10398721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10080625 + 318096 = 3175^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 10398721 - 2⁹ = 10398209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10398701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5199360 + 5199361.

It is an arithmetic number, because the mean of its divisors is an integer number (5199361).

Almost surely, 2^10398721 is an apocalyptic number.

It is an amenable number.

10398721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10398721 is an equidigital number, since it uses as much as digits as its factorization.

10398721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 10398721 is about 3224.7047926903. The cubic root of 10398721 is about 218.2696282230.

The spelling of 10398721 in words is "ten million, three hundred ninety-eight thousand, seven hundred twenty-one".