18039294109 has 4 divisors (see below), whose sum is σ = 18039726720. Its totient is φ = 18038861500.

The previous prime is 18039294061. The next prime is 18039294121. The reversal of 18039294109 is 90149293081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90149293081 = 17 ⋅5302899593.

It is a cyclic number.

It is not a de Polignac number, because 18039294109 - 2⁷ = 18039293981 is a prime.

It is a super-2 number, since 2×18039294109² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039294149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146179 + ... + 239680.

It is an arithmetic number, because the mean of its divisors is an integer number (4509931680).

Almost surely, 2^18039294109 is an apocalyptic number.

It is an amenable number.

18039294109 is a deficient number, since it is larger than the sum of its proper divisors (432611).

18039294109 is an equidigital number, since it uses as much as digits as its factorization.

18039294109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432610.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 18039294109 in words is "eighteen billion, thirty-nine million, two hundred ninety-four thousand, one hundred nine".