18311309939 has 8 divisors (see below), whose sum is σ = 19723358592. Its totient is φ = 16899759360.

The previous prime is 18311309923. The next prime is 18311309957. The reversal of 18311309939 is 93990311381.

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

It is a cyclic number.

It is not a de Polignac number, because 18311309939 - 2⁴ = 18311309923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18311309893 and 18311309902.

It is not an unprimeable number, because it can be changed into a prime (18311359939) 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, 46334 + ... + 196899.

It is an arithmetic number, because the mean of its divisors is an integer number (2465419824).

Almost surely, 2^18311309939 is an apocalyptic number.

18311309939 is a deficient number, since it is larger than the sum of its proper divisors (1412048653).

18311309939 is a wasteful number, since it uses less digits than its factorization.

18311309939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249037.

The product of its (nonzero) digits is 157464, while the sum is 47.

The spelling of 18311309939 in words is "eighteen billion, three hundred eleven million, three hundred nine thousand, nine hundred thirty-nine".