823378899 has 36 divisors (see below), whose sum is σ = 1299262104. Its totient is φ = 462381696.

The previous prime is 823378891. The next prime is 823378949. The reversal of 823378899 is 998873328.

823378899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 823378899 - 2³ = 823378891 is a prime.

It is a super-2 number, since 2×823378899² = 1355905622636904402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823378891) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2972349 + ... + 2972625.

It is an arithmetic number, because the mean of its divisors is an integer number (36090614).

Almost surely, 2^823378899 is an apocalyptic number.

823378899 is a deficient number, since it is larger than the sum of its proper divisors (475883205).

823378899 is an equidigital number, since it uses as much as digits as its factorization.

823378899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 360 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The square root of 823378899 is about 28694.5796100936. The cubic root of 823378899 is about 937.2740168559.

The spelling of 823378899 in words is "eight hundred twenty-three million, three hundred seventy-eight thousand, eight hundred ninety-nine".