243709493 has 4 divisors (see below), whose sum is σ = 246222060. Its totient is φ = 241196928.

The previous prime is 243709483. The next prime is 243709511. The reversal of 243709493 is 394907342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115068529 + 128640964 = 10727^2 + 11342^2 .

It is a cyclic number.

It is not a de Polignac number, because 243709493 - 2¹⁶ = 243643957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243709493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243709463) 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, 1256138 + ... + 1256331.

It is an arithmetic number, because the mean of its divisors is an integer number (61555515).

Almost surely, 2^243709493 is an apocalyptic number.

It is an amenable number.

243709493 is a deficient number, since it is larger than the sum of its proper divisors (2512567).

243709493 is an equidigital number, since it uses as much as digits as its factorization.

243709493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512566.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 243709493 is about 15611.1976798707. The cubic root of 243709493 is about 624.6318839208.

The spelling of 243709493 in words is "two hundred forty-three million, seven hundred nine thousand, four hundred ninety-three".