243657923 has 12 divisors (see below), whose sum is σ = 267193152. Its totient is φ = 221919360.

The previous prime is 243657901. The next prime is 243657937. The reversal of 243657923 is 329756342.

It is not a de Polignac number, because 243657923 - 2⁶ = 243657859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243657943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4640 + ... + 22557.

It is an arithmetic number, because the mean of its divisors is an integer number (22266096).

Almost surely, 2^243657923 is an apocalyptic number.

243657923 is a deficient number, since it is larger than the sum of its proper divisors (23535229).

243657923 is a wasteful number, since it uses less digits than its factorization.

243657923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27262 (or 27245 counting only the distinct ones).

The product of its digits is 272160, while the sum is 41.

The square root of 243657923 is about 15609.5458934589. The cubic root of 243657923 is about 624.5878225287.

The spelling of 243657923 in words is "two hundred forty-three million, six hundred fifty-seven thousand, nine hundred twenty-three".