898729409 has 12 divisors (see below), whose sum is σ = 920403900. Its totient is φ = 877521600.

The previous prime is 898729379. The next prime is 898729421. The reversal of 898729409 is 904927898.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 355699600 + 543029809 = 18860^2 + 23303^2 .

It is a de Polignac number, because none of the positive numbers 2^k-898729409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (898729309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553619 + ... + 555239.

It is an arithmetic number, because the mean of its divisors is an integer number (76700325).

Almost surely, 2^898729409 is an apocalyptic number.

It is an amenable number.

898729409 is a deficient number, since it is larger than the sum of its proper divisors (21674491).

898729409 is a wasteful number, since it uses less digits than its factorization.

898729409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892 (or 1831 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 898729409 is about 29978.8160039719. The cubic root of 898729409 is about 965.0348216917.

The spelling of 898729409 in words is "eight hundred ninety-eight million, seven hundred twenty-nine thousand, four hundred nine".