823749923 has 4 divisors (see below), whose sum is σ = 823834008. Its totient is φ = 823665840.

The previous prime is 823749803. The next prime is 823749929. The reversal of 823749923 is 329947328.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 823749923 - 2¹² = 823745827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823749929) 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, 25061 + ... + 47702.

It is an arithmetic number, because the mean of its divisors is an integer number (205958502).

Almost surely, 2^823749923 is an apocalyptic number.

823749923 is a deficient number, since it is larger than the sum of its proper divisors (84085).

823749923 is a wasteful number, since it uses less digits than its factorization.

823749923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84084.

The product of its digits is 653184, while the sum is 47.

The square root of 823749923 is about 28701.0439357177. The cubic root of 823749923 is about 937.4147778651.

The spelling of 823749923 in words is "eight hundred twenty-three million, seven hundred forty-nine thousand, nine hundred twenty-three".