243969739 has 4 divisors (see below), whose sum is σ = 262736656. Its totient is φ = 225202824.

The previous prime is 243969707. The next prime is 243969757. The reversal of 243969739 is 937969342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937969342 = 2 ⋅468984671.

It is a cyclic number.

It is not a de Polignac number, because 243969739 - 2⁵ = 243969707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243669739) 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, 9383439 + ... + 9383464.

It is an arithmetic number, because the mean of its divisors is an integer number (65684164).

Almost surely, 2^243969739 is an apocalyptic number.

243969739 is a deficient number, since it is larger than the sum of its proper divisors (18766917).

243969739 is a wasteful number, since it uses less digits than its factorization.

243969739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18766916.

The product of its digits is 2204496, while the sum is 52.

The square root of 243969739 is about 15619.5306907730. The cubic root of 243969739 is about 624.8541432439.

The spelling of 243969739 in words is "two hundred forty-three million, nine hundred sixty-nine thousand, seven hundred thirty-nine".