18922938109 has 8 divisors (see below), whose sum is σ = 19926332640. Its totient is φ = 17920288656.

The previous prime is 18922938107. The next prime is 18922938113. The reversal of 18922938109 is 90183922981.

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 18922938109 - 2¹ = 18922938107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18922938107) 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, 133747 + ... + 236080.

It is an arithmetic number, because the mean of its divisors is an integer number (2490791580).

Almost surely, 2^18922938109 is an apocalyptic number.

18922938109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18922938109 is a deficient number, since it is larger than the sum of its proper divisors (1003394531).

18922938109 is a wasteful number, since it uses less digits than its factorization.

18922938109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372539.

The product of its (nonzero) digits is 559872, while the sum is 52.

The spelling of 18922938109 in words is "eighteen billion, nine hundred twenty-two million, nine hundred thirty-eight thousand, one hundred nine".