899721843 has 16 divisors (see below), whose sum is σ = 1252889856. Its totient is φ = 573230240.

The previous prime is 899721833. The next prime is 899721847. The reversal of 899721843 is 348127998.

899721843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 899721843 - 2⁴ = 899721827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (899721847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83008 + ... + 93218.

It is an arithmetic number, because the mean of its divisors is an integer number (78305616).

Almost surely, 2^899721843 is an apocalyptic number.

899721843 is a deficient number, since it is larger than the sum of its proper divisors (353168013).

899721843 is a wasteful number, since it uses less digits than its factorization.

899721843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11514.

The product of its digits is 870912, while the sum is 51.

The square root of 899721843 is about 29995.3636917441. The cubic root of 899721843 is about 965.3899085676.

The spelling of 899721843 in words is "eight hundred ninety-nine million, seven hundred twenty-one thousand, eight hundred forty-three".