823620849 has 4 divisors (see below), whose sum is σ = 1098161136. Its totient is φ = 549080564.

The previous prime is 823620829. The next prime is 823620871. The reversal of 823620849 is 948026328.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 823620849 - 2⁵ = 823620817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 823620849.

It is not an unprimeable number, because it can be changed into a prime (823620829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137270139 + ... + 137270144.

It is an arithmetic number, because the mean of its divisors is an integer number (274540284).

Almost surely, 2^823620849 is an apocalyptic number.

It is an amenable number.

823620849 is a deficient number, since it is larger than the sum of its proper divisors (274540287).

823620849 is a wasteful number, since it uses less digits than its factorization.

823620849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274540286.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 823620849 is about 28698.7952534597. The cubic root of 823620849 is about 937.3658138968.

The spelling of 823620849 in words is "eight hundred twenty-three million, six hundred twenty thousand, eight hundred forty-nine".