18880681 has 4 divisors (see below), whose sum is σ = 18889552. Its totient is φ = 18871812.

The previous prime is 18880679. The next prime is 18880691. The reversal of 18880681 is 18608881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18880681 - 2¹ = 18880679 is a prime.

It is a super-2 number, since 2×18880681² = 712960230047522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18880601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886 + ... + 6208.

It is an arithmetic number, because the mean of its divisors is an integer number (4722388).

Almost surely, 2^18880681 is an apocalyptic number.

It is an amenable number.

18880681 is a deficient number, since it is larger than the sum of its proper divisors (8871).

18880681 is an equidigital number, since it uses as much as digits as its factorization.

18880681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 18880681 is about 4345.1905596878. The cubic root of 18880681 is about 266.2804107593.

The spelling of 18880681 in words is "eighteen million, eight hundred eighty thousand, six hundred eighty-one".