243400013 has 4 divisors (see below), whose sum is σ = 256210560. Its totient is φ = 230589468.

The previous prime is 243399997. The next prime is 243400043. The reversal of 243400013 is 310004342.

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 243400013 - 2⁴ = 243399997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243399964 and 243400000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243400043) 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, 6405245 + ... + 6405282.

It is an arithmetic number, because the mean of its divisors is an integer number (64052640).

Almost surely, 2^243400013 is an apocalyptic number.

It is an amenable number.

243400013 is a deficient number, since it is larger than the sum of its proper divisors (12810547).

243400013 is a wasteful number, since it uses less digits than its factorization.

243400013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12810546.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 243400013 is about 15601.2824152375. The cubic root of 243400013 is about 624.3673709582.

Adding to 243400013 its reverse (310004342), we get a palindrome (553404355).

The spelling of 243400013 in words is "two hundred forty-three million, four hundred thousand, thirteen".