18003835943 has 4 divisors (see below), whose sum is σ = 18172096200. Its totient is φ = 17835575688.

The previous prime is 18003835939. The next prime is 18003835951. The reversal of 18003835943 is 34953830081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34953830081 = 41 ⋅852532441.

It is a cyclic number.

It is not a de Polignac number, because 18003835943 - 2² = 18003835939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18003835894 and 18003835903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18003835973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84129968 + ... + 84130181.

It is an arithmetic number, because the mean of its divisors is an integer number (4543024050).

Almost surely, 2^18003835943 is an apocalyptic number.

18003835943 is a deficient number, since it is larger than the sum of its proper divisors (168260257).

18003835943 is a wasteful number, since it uses less digits than its factorization.

18003835943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168260256.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 18003835943 in words is "eighteen billion, three million, eight hundred thirty-five thousand, nine hundred forty-three".