18432681 has 12 divisors (see below), whose sum is σ = 25169328. Its totient is φ = 11999064.

The previous prime is 18432649. The next prime is 18432703. The reversal of 18432681 is 18623481.

It is not a de Polignac number, because 18432681 - 2⁵ = 18432649 is a prime.

It is a super-2 number, since 2×18432681² = 679527457695522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18432611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3886 + ... + 7208.

It is an arithmetic number, because the mean of its divisors is an integer number (2097444).

Almost surely, 2^18432681 is an apocalyptic number.

It is an amenable number.

18432681 is a deficient number, since it is larger than the sum of its proper divisors (6736647).

18432681 is an equidigital number, since it uses as much as digits as its factorization.

18432681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412 (or 3369 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 18432681 is about 4293.3298266031. The cubic root of 18432681 is about 264.1574330724.

The spelling of 18432681 in words is "eighteen million, four hundred thirty-two thousand, six hundred eighty-one".