18689416 has 8 divisors (see below), whose sum is σ = 35042670. Its totient is φ = 9344704.

The previous prime is 18689413. The next prime is 18689423. The reversal of 18689416 is 61498681.

It can be written as a sum of positive squares in only one way, i.e., 18096516 + 592900 = 4254^2 + 770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18689413) 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 as a sum of consecutive naturals, namely, 1168081 + ... + 1168096.

Almost surely, 2^18689416 is an apocalyptic number.

It is an amenable number.

18689416 is a deficient number, since it is larger than the sum of its proper divisors (16353254).

18689416 is a wasteful number, since it uses less digits than its factorization.

18689416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336183 (or 2336179 counting only the distinct ones).

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

The square root of 18689416 is about 4323.1257210495. The cubic root of 18689416 is about 265.3781997533.

The spelling of 18689416 in words is "eighteen million, six hundred eighty-nine thousand, four hundred sixteen".