18723116 has 6 divisors (see below), whose sum is σ = 32765460. Its totient is φ = 9361556.

The previous prime is 18723109. The next prime is 18723121. The reversal of 18723116 is 61132781.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2340386 + ... + 2340393.

It is an arithmetic number, because the mean of its divisors is an integer number (5460910).

Almost surely, 2^18723116 is an apocalyptic number.

It is an amenable number.

18723116 is a deficient number, since it is larger than the sum of its proper divisors (14042344).

18723116 is a wasteful number, since it uses less digits than its factorization.

18723116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680783 (or 4680781 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 18723116 is about 4327.0216084508. The cubic root of 18723116 is about 265.5376103942.

Adding to 18723116 its reverse (61132781), we get a palindrome (79855897).

The spelling of 18723116 in words is "eighteen million, seven hundred twenty-three thousand, one hundred sixteen".