18489121 has 6 divisors (see below), whose sum is σ = 21507810. Its totient is φ = 15847776.

The previous prime is 18489101. The next prime is 18489131. The reversal of 18489121 is 12198481.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 5239521 = 3640^2 + 2289^2 .

It is not a de Polignac number, because 18489121 - 2⁷ = 18488993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18489101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188616 + ... + 188713.

It is an arithmetic number, because the mean of its divisors is an integer number (3584635).

Almost surely, 2^18489121 is an apocalyptic number.

It is an amenable number.

18489121 is a deficient number, since it is larger than the sum of its proper divisors (3018689).

18489121 is an equidigital number, since it uses as much as digits as its factorization.

18489121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377343 (or 377336 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 18489121 is about 4299.8977894829. The cubic root of 18489121 is about 264.4267708937.

The spelling of 18489121 in words is "eighteen million, four hundred eighty-nine thousand, one hundred twenty-one".