823419845 has 4 divisors (see below), whose sum is σ = 988103820. Its totient is φ = 658735872.

The previous prime is 823419833. The next prime is 823419847. The reversal of 823419845 is 548914328.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 498807556 + 324612289 = 22334^2 + 18017^2 .

It is a cyclic number.

It is not a de Polignac number, because 823419845 - 2¹⁶ = 823354309 is a prime.

It is a super-2 number, since 2×823419845² = 1356040482279648050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 823419796 and 823419805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823419847) 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, 82341980 + ... + 82341989.

It is an arithmetic number, because the mean of its divisors is an integer number (247025955).

Almost surely, 2^823419845 is an apocalyptic number.

It is an amenable number.

823419845 is a deficient number, since it is larger than the sum of its proper divisors (164683975).

823419845 is a wasteful number, since it uses less digits than its factorization.

823419845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164683974.

The product of its digits is 276480, while the sum is 44.

The square root of 823419845 is about 28695.2930809218. The cubic root of 823419845 is about 937.2895532372.

The spelling of 823419845 in words is "eight hundred twenty-three million, four hundred nineteen thousand, eight hundred forty-five".