243000019 has 8 divisors (see below), whose sum is σ = 252054000. Its totient is φ = 233991072.

The previous prime is 243000007. The next prime is 243000029. The reversal of 243000019 is 910000342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243000019 is a prime.

It is a super-2 number, since 2×243000019² = 118098018468000722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243000029) 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, 64 + ... + 22045.

It is an arithmetic number, because the mean of its divisors is an integer number (31506750).

Almost surely, 2^243000019 is an apocalyptic number.

243000019 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

243000019 is a deficient number, since it is larger than the sum of its proper divisors (9053981).

243000019 is a wasteful number, since it uses less digits than its factorization.

243000019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22517.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 243000019 is about 15588.4578775452. The cubic root of 243000019 is about 624.0251631796.

The spelling of 243000019 in words is "two hundred forty-three million, nineteen", and thus it is an aban number.