853983729 has 45 divisors (see below), whose sum is σ = 1362291931. Its totient is φ = 533027520.

The previous prime is 853983719. The next prime is 853983731. The reversal of 853983729 is 927389358.

It is a happy number.

The square root of 853983729 is 29223.

It is a perfect power (a square), and thus also a powerful number.

853983729 is a `hidden beast` number, since 8 + 539 + 83 + 7 + 29 = 666.

It can be written as a sum of positive squares in only one way, i.e., 664866225 + 189117504 = 25785^2 + 13752^2 .

It is not a de Polignac number, because 853983729 - 2⁹ = 853983217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853983719) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4471024 + ... + 4471214.

Almost surely, 2^853983729 is an apocalyptic number.

853983729 is the 29223-rd square number.

853983729 is the 14612-nd centered octagonal number.

It is an amenable number.

853983729 is a deficient number, since it is larger than the sum of its proper divisors (508308202).

853983729 is an equidigital number, since it uses as much as digits as its factorization.

853983729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 211 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The cubic root of 853983729 is about 948.7457979161.

The spelling of 853983729 in words is "eight hundred fifty-three million, nine hundred eighty-three thousand, seven hundred twenty-nine".