18618489 has 12 divisors (see below), whose sum is σ = 27036672. Its totient is φ = 12346200.

The previous prime is 18618463. The next prime is 18618503. The reversal of 18618489 is 98481681.

It is not a de Polignac number, because 18618489 - 2¹¹ = 18616441 is a prime.

It is a super-3 number, since 3×18618489³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18618409) 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 11 ways as a sum of consecutive naturals, for example, 3697 + ... + 7134.

It is an arithmetic number, because the mean of its divisors is an integer number (2253056).

Almost surely, 2^18618489 is an apocalyptic number.

It is an amenable number.

18618489 is a deficient number, since it is larger than the sum of its proper divisors (8418183).

18618489 is a wasteful number, since it uses less digits than its factorization.

18618489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11028 (or 11025 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 18618489 is about 4314.9147152638. The cubic root of 18618489 is about 265.0420676066.

The spelling of 18618489 in words is "eighteen million, six hundred eighteen thousand, four hundred eighty-nine".