243402215 has 32 divisors (see below), whose sum is σ = 350217216. Its totient is φ = 158780160.

The previous prime is 243402167. The next prime is 243402241. The reversal of 243402215 is 512204342.

It is a happy number.

It is not a de Polignac number, because 243402215 - 2⁶ = 243402151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169139 + ... + 170571.

It is an arithmetic number, because the mean of its divisors is an integer number (10944288).

Almost surely, 2^243402215 is an apocalyptic number.

243402215 is a deficient number, since it is larger than the sum of its proper divisors (106815001).

243402215 is a wasteful number, since it uses less digits than its factorization.

243402215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 243402215 is about 15601.3529861996. The cubic root of 243402215 is about 624.3692538022.

Adding to 243402215 its reverse (512204342), we get a palindrome (755606557).

The spelling of 243402215 in words is "two hundred forty-three million, four hundred two thousand, two hundred fifteen".