823740399 has 12 divisors (see below), whose sum is σ = 1190974200. Its totient is φ = 548640144.

The previous prime is 823740397. The next prime is 823740419. The reversal of 823740399 is 993047328.

It is a happy number.

823740399 is a `hidden beast` number, since 8 + 237 + 403 + 9 + 9 = 666.

It is not a de Polignac number, because 823740399 - 2¹ = 823740397 is a prime.

It is a super-3 number, since 3×823740399³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823740397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33189 + ... + 52430.

It is an arithmetic number, because the mean of its divisors is an integer number (99247850).

Almost surely, 2^823740399 is an apocalyptic number.

823740399 is a deficient number, since it is larger than the sum of its proper divisors (367233801).

823740399 is a wasteful number, since it uses less digits than its factorization.

823740399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86694 (or 86691 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 823740399 is about 28700.8780179283. The cubic root of 823740399 is about 937.4111651292.

The spelling of 823740399 in words is "eight hundred twenty-three million, seven hundred forty thousand, three hundred ninety-nine".