823411947 has 4 divisors (see below), whose sum is σ = 1097882600. Its totient is φ = 548941296.

The previous prime is 823411943. The next prime is 823411957. The reversal of 823411947 is 749114328.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 823411947 - 2² = 823411943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823411943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137235322 + ... + 137235327.

It is an arithmetic number, because the mean of its divisors is an integer number (274470650).

Almost surely, 2^823411947 is an apocalyptic number.

823411947 is a deficient number, since it is larger than the sum of its proper divisors (274470653).

823411947 is a wasteful number, since it uses less digits than its factorization.

823411947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274470652.

The product of its digits is 48384, while the sum is 39.

The square root of 823411947 is about 28695.1554622030. The cubic root of 823411947 is about 937.2865564928.

The spelling of 823411947 in words is "eight hundred twenty-three million, four hundred eleven thousand, nine hundred forty-seven".