243402073 has 4 divisors (see below), whose sum is σ = 257719860. Its totient is φ = 229084288.

The previous prime is 243402067. The next prime is 243402091. The reversal of 243402073 is 370204342.

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 140825689 + 102576384 = 11867^2 + 10128^2 .

It is a cyclic number.

It is not a de Polignac number, because 243402073 - 2⁵ = 243402041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243402043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7158868 + ... + 7158901.

It is an arithmetic number, because the mean of its divisors is an integer number (64429965).

Almost surely, 2^243402073 is an apocalyptic number.

It is an amenable number.

243402073 is a deficient number, since it is larger than the sum of its proper divisors (14317787).

243402073 is a wasteful number, since it uses less digits than its factorization.

243402073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14317786.

The product of its (nonzero) digits is 4032, while the sum is 25.

The square root of 243402073 is about 15601.3484353116. The cubic root of 243402073 is about 624.3691323839.

The spelling of 243402073 in words is "two hundred forty-three million, four hundred two thousand, seventy-three".