243969387 has 4 divisors (see below), whose sum is σ = 325292520. Its totient is φ = 162646256.

The previous prime is 243969377. The next prime is 243969389. The reversal of 243969387 is 783969342.

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 243969387 - 2⁴ = 243969371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243969389) 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, 40661562 + ... + 40661567.

It is an arithmetic number, because the mean of its divisors is an integer number (81323130).

Almost surely, 2^243969387 is an apocalyptic number.

243969387 is a deficient number, since it is larger than the sum of its proper divisors (81323133).

243969387 is an equidigital number, since it uses as much as digits as its factorization.

243969387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81323132.

The product of its digits is 1959552, while the sum is 51.

The square root of 243969387 is about 15619.5194228248. The cubic root of 243969387 is about 624.8538427302.

The spelling of 243969387 in words is "two hundred forty-three million, nine hundred sixty-nine thousand, three hundred eighty-seven".