823397800 has 24 divisors (see below), whose sum is σ = 1914400350. Its totient is φ = 329359040.

The previous prime is 823397767. The next prime is 823397821. The reversal of 823397800 is 8793328.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 552532036 + 270865764 = 23506^2 + 16458^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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 5 ways as a sum of consecutive naturals, for example, 2058295 + ... + 2058694.

Almost surely, 2^823397800 is an apocalyptic number.

It is an amenable number.

823397800 is an abundant number, since it is smaller than the sum of its proper divisors (1091002550).

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

823397800 is a wasteful number, since it uses less digits than its factorization.

823397800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117005 (or 4116996 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 823397800 is about 28694.9089561197. The cubic root of 823397800 is about 937.2811886374.

The spelling of 823397800 in words is "eight hundred twenty-three million, three hundred ninety-seven thousand, eight hundred".