823995438 has 64 divisors (see below), whose sum is σ = 1969029120. Its totient is φ = 224920800.

The previous prime is 823995437. The next prime is 823995443. The reversal of 823995438 is 834599328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823995437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98853 + ... + 106863.

It is an arithmetic number, because the mean of its divisors is an integer number (30766080).

Almost surely, 2^823995438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 823995438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984514560).

823995438 is an abundant number, since it is smaller than the sum of its proper divisors (1145033682).

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

823995438 is a wasteful number, since it uses less digits than its factorization.

823995438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133.

The product of its digits is 1866240, while the sum is 51.

The square root of 823995438 is about 28705.3207263044. The cubic root of 823995438 is about 937.5078993823.

The spelling of 823995438 in words is "eight hundred twenty-three million, nine hundred ninety-five thousand, four hundred thirty-eight".