853949720836 has 27 divisors (see below), whose sum is σ = 1562289190581. Its totient is φ = 408390405984.

The previous prime is 853949720821. The next prime is 853949720839. The reversal of 853949720836 is 638027949358.

The square root of 853949720836 is 924094.

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

It can be written as a sum of positive squares in only one way, i.e., 112422066436 + 741527654400 = 335294^2 + 861120^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853949720839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 42498280 + ... + 42518368.

Almost surely, 2^853949720836 is an apocalyptic number.

853949720836 is the 924094-th square number.

It is an amenable number.

853949720836 is a deficient number, since it is larger than the sum of its proper divisors (708339469745).

853949720836 is an frugal number, since it uses more digits than its factorization.

853949720836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40228 (or 20114 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 64.

Multiplying 853949720836 by its sum of digits (64), we get a square (54652782133504 = 7392752²).

The spelling of 853949720836 in words is "eight hundred fifty-three billion, nine hundred forty-nine million, seven hundred twenty thousand, eight hundred thirty-six".