823442409 has 48 divisors (see below), whose sum is σ = 1270785600. Its totient is φ = 526777344.

The previous prime is 823442393. The next prime is 823442453. The reversal of 823442409 is 904244328.

It is not a de Polignac number, because 823442409 - 2⁴ = 823442393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (823442479) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8489049 + ... + 8489145.

It is an arithmetic number, because the mean of its divisors is an integer number (26474700).

Almost surely, 2^823442409 is an apocalyptic number.

It is an amenable number.

823442409 is a deficient number, since it is larger than the sum of its proper divisors (447343191).

823442409 is an equidigital number, since it uses as much as digits as its factorization.

823442409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 823442409 is about 28695.6862437545. The cubic root of 823442409 is about 937.2981146082.

The spelling of 823442409 in words is "eight hundred twenty-three million, four hundred forty-two thousand, four hundred nine".