243438137 has 8 divisors (see below), whose sum is σ = 248440200. Its totient is φ = 238481280.

The previous prime is 243438101. The next prime is 243438157. The reversal of 243438137 is 731834342.

It can be written as a sum of positive squares in 4 ways, for example, as 16152361 + 227285776 = 4019^2 + 15076^2 .

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 243438137 - 2¹⁰ = 243437113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243438097 and 243438106.

It is not an unprimeable number, because it can be changed into a prime (243438157) 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, 314 + ... + 22067.

It is an arithmetic number, because the mean of its divisors is an integer number (31055025).

Almost surely, 2^243438137 is an apocalyptic number.

It is an amenable number.

243438137 is a deficient number, since it is larger than the sum of its proper divisors (5002063).

243438137 is a wasteful number, since it uses less digits than its factorization.

243438137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22603.

The product of its digits is 48384, while the sum is 35.

The square root of 243438137 is about 15602.5041900331. The cubic root of 243438137 is about 624.3999676957.

The spelling of 243438137 in words is "two hundred forty-three million, four hundred thirty-eight thousand, one hundred thirty-seven".