18814433939 has 4 divisors (see below), whose sum is σ = 21502210224. Its totient is φ = 16126657656.

The previous prime is 18814433933. The next prime is 18814433971. The reversal of 18814433939 is 93933441881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93933441881 = 178819 ⋅525299.

It is a cyclic number.

It is not a de Polignac number, because 18814433939 - 2²⁸ = 18545998483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18814433933) 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, 1343888132 + ... + 1343888145.

It is an arithmetic number, because the mean of its divisors is an integer number (5375552556).

Almost surely, 2^18814433939 is an apocalyptic number.

18814433939 is a deficient number, since it is larger than the sum of its proper divisors (2687776285).

18814433939 is an equidigital number, since it uses as much as digits as its factorization.

18814433939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687776284.

The product of its digits is 2239488, while the sum is 53.

The spelling of 18814433939 in words is "eighteen billion, eight hundred fourteen million, four hundred thirty-three thousand, nine hundred thirty-nine".