18145616 has 40 divisors (see below), whose sum is σ = 36456000. Its totient is φ = 8743680.

The previous prime is 18145529. The next prime is 18145637. The reversal of 18145616 is 61654181.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91085 + ... + 91283.

It is an arithmetic number, because the mean of its divisors is an integer number (911400).

Almost surely, 2^18145616 is an apocalyptic number.

18145616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18145616 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

18145616 is a wasteful number, since it uses less digits than its factorization.

18145616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 381 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 18145616 is about 4259.7671297854. The cubic root of 18145616 is about 262.7789494215.

Adding to 18145616 its reverse (61654181), we get a palindrome (79799797).

The spelling of 18145616 in words is "eighteen million, one hundred forty-five thousand, six hundred sixteen".