243629865 has 12 divisors (see below), whose sum is σ = 422291844. Its totient is φ = 129935904.

The previous prime is 243629861. The next prime is 243629879. The reversal of 243629865 is 568926342.

It can be written as a sum of positive squares in 2 ways, for example, as 189695529 + 53934336 = 13773^2 + 7344^2 .

It is not a de Polignac number, because 243629865 - 2² = 243629861 is a prime.

It is a super-2 number, since 2×243629865² = 118711022239836450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5413997 = 243629865 / (2 + 4 + 3 + 6 + 2 + 9 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 243629865.

It is not an unprimeable number, because it can be changed into a prime (243629861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2706954 + ... + 2707043.

It is an arithmetic number, because the mean of its divisors is an integer number (35190987).

Almost surely, 2^243629865 is an apocalyptic number.

It is an amenable number.

243629865 is a deficient number, since it is larger than the sum of its proper divisors (178661979).

243629865 is a wasteful number, since it uses less digits than its factorization.

243629865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5414008 (or 5414005 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 243629865 is about 15608.6471226689. The cubic root of 243629865 is about 624.5638471706.

The spelling of 243629865 in words is "two hundred forty-three million, six hundred twenty-nine thousand, eight hundred sixty-five".