243400267493 has 8 divisors (see below), whose sum is σ = 246087392760. Its totient is φ = 240721398720.

The previous prime is 243400267441. The next prime is 243400267501. The reversal of 243400267493 is 394762004342.

It can be written as a sum of positive squares in 4 ways, for example, as 15435080644 + 227965186849 = 124238^2 + 477457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243400267493 - 2¹² = 243400263397 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 (243400267403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2004830 + ... + 2122767.

It is an arithmetic number, because the mean of its divisors is an integer number (30760924095).

Almost surely, 2^243400267493 is an apocalyptic number.

It is an amenable number.

243400267493 is a deficient number, since it is larger than the sum of its proper divisors (2687125267).

243400267493 is a wasteful number, since it uses less digits than its factorization.

243400267493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128247.

The product of its (nonzero) digits is 870912, while the sum is 44.

The spelling of 243400267493 in words is "two hundred forty-three billion, four hundred million, two hundred sixty-seven thousand, four hundred ninety-three".