18888681 has 16 divisors (see below), whose sum is σ = 30034944. Its totient is φ = 10323984.

The previous prime is 18888671. The next prime is 18888691. The reversal of 18888681 is 18688881.

It is an interprime number because it is at equal distance from previous prime (18888671) and next prime (18888691).

It is not a de Polignac number, because 18888681 - 2⁹ = 18888169 is a prime.

It is a super-2 number, since 2×18888681² = 713564539839522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18888681.

It is not an unprimeable number, because it can be changed into a prime (18888631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19071 + ... + 20036.

It is an arithmetic number, because the mean of its divisors is an integer number (1877184).

Almost surely, 2^18888681 is an apocalyptic number.

It is an amenable number.

18888681 is a deficient number, since it is larger than the sum of its proper divisors (11146263).

18888681 is a wasteful number, since it uses less digits than its factorization.

18888681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39140.

The product of its digits is 196608, while the sum is 48.

The square root of 18888681 is about 4346.1110202111. Note that the first 3 decimals coincide. The cubic root of 18888681 is about 266.3180143197.

The spelling of 18888681 in words is "eighteen million, eight hundred eighty-eight thousand, six hundred eighty-one".