18154889 has 4 divisors (see below), whose sum is σ = 18944256. Its totient is φ = 17365524.

The previous prime is 18154867. The next prime is 18154909. The reversal of 18154889 is 98845181.

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: 98845181 = 1063 ⋅92987.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18154889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18154819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394649 + ... + 394694.

It is an arithmetic number, because the mean of its divisors is an integer number (4736064).

Almost surely, 2^18154889 is an apocalyptic number.

It is an amenable number.

18154889 is a deficient number, since it is larger than the sum of its proper divisors (789367).

18154889 is an equidigital number, since it uses as much as digits as its factorization.

18154889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789366.

The product of its digits is 92160, while the sum is 44.

The square root of 18154889 is about 4260.8554305444. The cubic root of 18154889 is about 262.8237046621.

The spelling of 18154889 in words is "eighteen million, one hundred fifty-four thousand, eight hundred eighty-nine".