203664243 has 8 divisors (see below), whose sum is σ = 278891728. Its totient is φ = 132106464.

The previous prime is 203664239. The next prime is 203664311. The reversal of 203664243 is 342466302.

It is a happy number.

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

It is not a de Polignac number, because 203664243 - 2² = 203664239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203664243.

It is not an unprimeable number, because it can be changed into a prime (203664143) 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, 917296 + ... + 917517.

It is an arithmetic number, because the mean of its divisors is an integer number (34861466).

Almost surely, 2^203664243 is an apocalyptic number.

203664243 is a deficient number, since it is larger than the sum of its proper divisors (75227485).

203664243 is a wasteful number, since it uses less digits than its factorization.

203664243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834853.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 203664243 is about 14271.0981707786. The cubic root of 203664243 is about 588.3533931230.

The spelling of 203664243 in words is "two hundred three million, six hundred sixty-four thousand, two hundred forty-three".