18768081 has 16 divisors (see below), whose sum is σ = 25969856. Its totient is φ = 12047616.

The previous prime is 18768073. The next prime is 18768089. The reversal of 18768081 is 18086781.

It is an interprime number because it is at equal distance from previous prime (18768073) and next prime (18768089).

It is not a de Polignac number, because 18768081 - 2³ = 18768073 is a prime.

It is a super-2 number, since 2×18768081² = 704481728845122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18768089) 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 15 ways as a sum of consecutive naturals, for example, 8421 + ... + 10413.

It is an arithmetic number, because the mean of its divisors is an integer number (1623116).

Almost surely, 2^18768081 is an apocalyptic number.

It is an amenable number.

18768081 is a deficient number, since it is larger than the sum of its proper divisors (7201775).

18768081 is a wasteful number, since it uses less digits than its factorization.

18768081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 18768081 is about 4332.2143298780. The cubic root of 18768081 is about 265.7500101035.

The spelling of 18768081 in words is "eighteen million, seven hundred sixty-eight thousand, eighty-one".