923128247 has 4 divisors (see below), whose sum is σ = 923337576. Its totient is φ = 922918920.

The previous prime is 923128229. The next prime is 923128249. The reversal of 923128247 is 742821329.

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

It is a cyclic number.

It is not a de Polignac number, because 923128247 - 2¹² = 923124151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 923128247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (923128249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97904 + ... + 106917.

It is an arithmetic number, because the mean of its divisors is an integer number (230834394).

Almost surely, 2^923128247 is an apocalyptic number.

923128247 is a deficient number, since it is larger than the sum of its proper divisors (209329).

923128247 is a wasteful number, since it uses less digits than its factorization.

923128247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209328.

The product of its digits is 48384, while the sum is 38.

The square root of 923128247 is about 30383.0256393270. The cubic root of 923128247 is about 973.6899335162.

It can be divided in two parts, 9231282 and 47, that added together give a palindrome (9231329).

The spelling of 923128247 in words is "nine hundred twenty-three million, one hundred twenty-eight thousand, two hundred forty-seven".