18389026381 has 8 divisors (see below), whose sum is σ = 20602939104. Its totient is φ = 16265477520.

The previous prime is 18389026343. The next prime is 18389026393. The reversal of 18389026381 is 18362098381.

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 18389026381 - 2¹³ = 18389018189 is a prime.

It is a super-2 number, since 2×18389026381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18389026181) 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, 22590535 + ... + 22591348.

It is an arithmetic number, because the mean of its divisors is an integer number (2575367388).

Almost surely, 2^18389026381 is an apocalyptic number.

18389026381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18389026381 is a deficient number, since it is larger than the sum of its proper divisors (2213912723).

18389026381 is a wasteful number, since it uses less digits than its factorization.

18389026381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45181931.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 18389026381 in words is "eighteen billion, three hundred eighty-nine million, twenty-six thousand, three hundred eighty-one".