18340681 has 8 divisors (see below), whose sum is σ = 19634400. Its totient is φ = 17079840.

The previous prime is 18340639. The next prime is 18340709. The reversal of 18340681 is 18604381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18340681 - 2⁹ = 18340169 is a prime.

It is a super-2 number, since 2×18340681² = 672761159087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18340631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7060 + ... + 9301.

It is an arithmetic number, because the mean of its divisors is an integer number (2454300).

Almost surely, 2^18340681 is an apocalyptic number.

It is an amenable number.

18340681 is a deficient number, since it is larger than the sum of its proper divisors (1293719).

18340681 is a wasteful number, since it uses less digits than its factorization.

18340681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16439.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18340681 is about 4282.6021295469. The cubic root of 18340681 is about 263.7172180605.

The spelling of 18340681 in words is "eighteen million, three hundred forty thousand, six hundred eighty-one".