18489616 has 10 divisors (see below), whose sum is σ = 35823662. Its totient is φ = 9244800.

The previous prime is 18489571. The next prime is 18489623. The reversal of 18489616 is 61698481.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 1679616 = 4100^2 + 1296^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577785 + ... + 577816.

Almost surely, 2^18489616 is an apocalyptic number.

18489616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18489616 is a deficient number, since it is larger than the sum of its proper divisors (17334046).

18489616 is a wasteful number, since it uses less digits than its factorization.

18489616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155609 (or 1155603 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 18489616 is about 4299.9553486054. The cubic root of 18489616 is about 264.4291306613.

The spelling of 18489616 in words is "eighteen million, four hundred eighty-nine thousand, six hundred sixteen".