815853852 has 72 divisors (see below), whose sum is σ = 2267096832. Its totient is φ = 245325600.

The previous prime is 815853827. The next prime is 815853853. The reversal of 815853852 is 258358518.

It is a junction number, because it is equal to n+sod(n) for n = 815853798 and 815853807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815853853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44013 + ... + 59739.

It is an arithmetic number, because the mean of its divisors is an integer number (31487456).

Almost surely, 2^815853852 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 815853852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1133548416).

815853852 is an abundant number, since it is smaller than the sum of its proper divisors (1451242980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

815853852 is a wasteful number, since it uses less digits than its factorization.

815853852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15879 (or 15874 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The square root of 815853852 is about 28563.1554979488. The cubic root of 815853852 is about 934.4099538189.

The spelling of 815853852 in words is "eight hundred fifteen million, eight hundred fifty-three thousand, eight hundred fifty-two".