265640237 has 4 divisors (see below), whose sum is σ = 265672896. Its totient is φ = 265607580.

The previous prime is 265640227. The next prime is 265640251. The reversal of 265640237 is 732046562.

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 265640237 - 2²⁰ = 264591661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 265640197 and 265640206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265640227) 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, 6668 + ... + 23994.

It is an arithmetic number, because the mean of its divisors is an integer number (66418224).

Almost surely, 2^265640237 is an apocalyptic number.

It is an amenable number.

265640237 is a deficient number, since it is larger than the sum of its proper divisors (32659).

265640237 is a wasteful number, since it uses less digits than its factorization.

265640237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32658.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 265640237 is about 16298.4734561247. The cubic root of 265640237 is about 642.8326887606.

Adding to 265640237 its reverse (732046562), we get a palindrome (997686799).

The spelling of 265640237 in words is "two hundred sixty-five million, six hundred forty thousand, two hundred thirty-seven".