243400613 has 4 divisors (see below), whose sum is σ = 243432000. Its totient is φ = 243369228.

The previous prime is 243400579. The next prime is 243400631. The reversal of 243400613 is 316004342.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 243400613 - 2¹⁰ = 243399589 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 (243400673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5306 + ... + 22692.

It is an arithmetic number, because the mean of its divisors is an integer number (60858000).

Almost surely, 2^243400613 is an apocalyptic number.

It is an amenable number.

243400613 is a deficient number, since it is larger than the sum of its proper divisors (31387).

243400613 is a wasteful number, since it uses less digits than its factorization.

243400613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31386.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 243400613 is about 15601.3016444142. The cubic root of 243400613 is about 624.3678839958.

Adding to 243400613 its reverse (316004342), we get a palindrome (559404955).

The spelling of 243400613 in words is "two hundred forty-three million, four hundred thousand, six hundred thirteen".