18950681 has 8 divisors (see below), whose sum is σ = 19440000. Its totient is φ = 18467680.

The previous prime is 18950669. The next prime is 18950707. The reversal of 18950681 is 18605981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18950681 is a prime.

It is a super-2 number, since 2×18950681² = 718256620727522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18950621) 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, 4820 + ... + 7818.

It is an arithmetic number, because the mean of its divisors is an integer number (2430000).

Almost surely, 2^18950681 is an apocalyptic number.

It is an amenable number.

18950681 is a deficient number, since it is larger than the sum of its proper divisors (489319).

18950681 is an equidigital number, since it uses as much as digits as its factorization.

18950681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18950681 is about 4353.2379902780. The cubic root of 18950681 is about 266.6090825314.

The spelling of 18950681 in words is "eighteen million, nine hundred fifty thousand, six hundred eighty-one".