823445939 has 2 divisors, whose sum is σ = 823445940. Its totient is φ = 823445938.

The previous prime is 823445897. The next prime is 823445971. The reversal of 823445939 is 939544328.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 823445939 - 2²⁸ = 555010483 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 823445893 and 823445902.

It is not a weakly prime, because it can be changed into another prime (823445339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411722969 + 411722970.

It is an arithmetic number, because the mean of its divisors is an integer number (411722970).

Almost surely, 2^823445939 is an apocalyptic number.

823445939 is a deficient number, since it is larger than the sum of its proper divisors (1).

823445939 is an equidigital number, since it uses as much as digits as its factorization.

823445939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 47.

The square root of 823445939 is about 28695.7477511913. The cubic root of 823445939 is about 937.2994539683.

The spelling of 823445939 in words is "eight hundred twenty-three million, four hundred forty-five thousand, nine hundred thirty-nine".