243661826 has 8 divisors (see below), whose sum is σ = 365610240. Its totient is φ = 121791748.

The previous prime is 243661823. The next prime is 243661841. The reversal of 243661826 is 628166342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243661826.

It is not an unprimeable number, because it can be changed into a prime (243661823) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11066 + ... + 24693.

It is an arithmetic number, because the mean of its divisors is an integer number (45701280).

Almost surely, 2^243661826 is an apocalyptic number.

243661826 is a deficient number, since it is larger than the sum of its proper divisors (121948414).

243661826 is a wasteful number, since it uses less digits than its factorization.

243661826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39168.

The product of its digits is 82944, while the sum is 38.

The square root of 243661826 is about 15609.6709126106. The cubic root of 243661826 is about 624.5911574681.

The spelling of 243661826 in words is "two hundred forty-three million, six hundred sixty-one thousand, eight hundred twenty-six".