18371939 has 4 divisors (see below), whose sum is σ = 18382656. Its totient is φ = 18361224.

The previous prime is 18371923. The next prime is 18371953. The reversal of 18371939 is 93917381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18371939 - 2⁴ = 18371923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18371896 and 18371905.

It is not an unprimeable number, because it can be changed into a prime (18371959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (4595664).

Almost surely, 2^18371939 is an apocalyptic number.

18371939 is a deficient number, since it is larger than the sum of its proper divisors (10717).

18371939 is an equidigital number, since it uses as much as digits as its factorization.

18371939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716.

The product of its digits is 40824, while the sum is 41.

The square root of 18371939 is about 4286.2499927092. The cubic root of 18371939 is about 263.8669506728.

The spelling of 18371939 in words is "eighteen million, three hundred seventy-one thousand, nine hundred thirty-nine".