899659729 has 4 divisors (see below), whose sum is σ = 899731876. Its totient is φ = 899587584.

The previous prime is 899659727. The next prime is 899659751. The reversal of 899659729 is 927956998.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 859329 + 898800400 = 927^2 + 29980^2 .

It is a cyclic number.

It is not a de Polignac number, because 899659729 - 2¹ = 899659727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (899659727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12024 + ... + 44089.

It is an arithmetic number, because the mean of its divisors is an integer number (224932969).

Almost surely, 2^899659729 is an apocalyptic number.

899659729 is the 16033-rd nonagonal number.

It is an amenable number.

899659729 is a deficient number, since it is larger than the sum of its proper divisors (72147).

899659729 is a wasteful number, since it uses less digits than its factorization.

899659729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72146.

The product of its digits is 22044960, while the sum is 64.

The square root of 899659729 is about 29994.3282805266. The cubic root of 899659729 is about 965.3676922166.

The spelling of 899659729 in words is "eight hundred ninety-nine million, six hundred fifty-nine thousand, seven hundred twenty-nine".