823771404 has 96 divisors (see below), whose sum is σ = 2289047040. Its totient is φ = 255524544.

The previous prime is 823771387. The next prime is 823771411. The reversal of 823771404 is 404177328.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87427 + ... + 96389.

It is an arithmetic number, because the mean of its divisors is an integer number (23844240).

Almost surely, 2^823771404 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 823771404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1144523520).

823771404 is an abundant number, since it is smaller than the sum of its proper divisors (1465275636).

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

823771404 is a wasteful number, since it uses less digits than its factorization.

823771404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9036 (or 9028 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 823771404 is about 28701.4181531157. The cubic root of 823771404 is about 937.4229261438.

The spelling of 823771404 in words is "eight hundred twenty-three million, seven hundred seventy-one thousand, four hundred four".