243708389 has 4 divisors (see below), whose sum is σ = 243824256. Its totient is φ = 243592524.

The previous prime is 243708371. The next prime is 243708401. The reversal of 243708389 is 983807342.

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 243708389 - 2¹⁶ = 243642853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243708319) 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, 54719 + ... + 59004.

It is an arithmetic number, because the mean of its divisors is an integer number (60956064).

Almost surely, 2^243708389 is an apocalyptic number.

It is an amenable number.

243708389 is a deficient number, since it is larger than the sum of its proper divisors (115867).

243708389 is a wasteful number, since it uses less digits than its factorization.

243708389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115866.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 243708389 is about 15611.1623205961. The cubic root of 243708389 is about 624.6309407286.

The spelling of 243708389 in words is "two hundred forty-three million, seven hundred eight thousand, three hundred eighty-nine".