18051389 has 8 divisors (see below), whose sum is σ = 18960000. Its totient is φ = 17153136.

The previous prime is 18051379. The next prime is 18051403. The reversal of 18051389 is 98315081.

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 18051389 - 2¹⁶ = 17985853 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 (18051329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112 + ... + 6110.

It is an arithmetic number, because the mean of its divisors is an integer number (2370000).

Almost surely, 2^18051389 is an apocalyptic number.

It is an amenable number.

18051389 is a deficient number, since it is larger than the sum of its proper divisors (908611).

18051389 is a wasteful number, since it uses less digits than its factorization.

18051389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5179.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18051389 is about 4248.6926224428. The cubic root of 18051389 is about 262.3233048228.

The spelling of 18051389 in words is "eighteen million, fifty-one thousand, three hundred eighty-nine".