823989572 has 24 divisors (see below), whose sum is σ = 1648657920. Its totient is φ = 352992960.

The previous prime is 823989503. The next prime is 823989581. The reversal of 823989572 is 275989328.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89672 + ... + 98432.

It is an arithmetic number, because the mean of its divisors is an integer number (68694080).

Almost surely, 2^823989572 is an apocalyptic number.

It is an amenable number.

823989572 is an abundant number, since it is smaller than the sum of its proper divisors (824668348).

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

823989572 is a wasteful number, since it uses less digits than its factorization.

823989572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12131 (or 12129 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 53.

The square root of 823989572 is about 28705.2185499431. The cubic root of 823989572 is about 937.5056746797.

The spelling of 823989572 in words is "eight hundred twenty-three million, nine hundred eighty-nine thousand, five hundred seventy-two".