849583721 has 16 divisors (see below), whose sum is σ = 1028837376. Its totient is φ = 684865536.

The previous prime is 849583699. The next prime is 849583741. The reversal of 849583721 is 127385948.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-849583721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (849583741) 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, 314840 + ... + 317526.

It is an arithmetic number, because the mean of its divisors is an integer number (64302336).

Almost surely, 2^849583721 is an apocalyptic number.

It is an amenable number.

849583721 is a deficient number, since it is larger than the sum of its proper divisors (179253655).

849583721 is a wasteful number, since it uses less digits than its factorization.

849583721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368.

The product of its digits is 483840, while the sum is 47.

The square root of 849583721 is about 29147.6194739811. The cubic root of 849583721 is about 947.1135735527.

The spelling of 849583721 in words is "eight hundred forty-nine million, five hundred eighty-three thousand, seven hundred twenty-one".