18944681 has 8 divisors (see below), whose sum is σ = 22924800. Its totient is φ = 15283008.

The previous prime is 18944669. The next prime is 18944693. The reversal of 18944681 is 18644981.

It is an interprime number because it is at equal distance from previous prime (18944669) and next prime (18944693).

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-18944681 is a prime.

It is a super-2 number, since 2×18944681² = 717801876383522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18944621) 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, 79481 + ... + 79718.

It is an arithmetic number, because the mean of its divisors is an integer number (2865600).

Almost surely, 2^18944681 is an apocalyptic number.

It is an amenable number.

18944681 is a deficient number, since it is larger than the sum of its proper divisors (3980119).

18944681 is a wasteful number, since it uses less digits than its factorization.

18944681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159223.

The product of its digits is 55296, while the sum is 41.

The square root of 18944681 is about 4352.5487935232. The cubic root of 18944681 is about 266.5809424108.

The spelling of 18944681 in words is "eighteen million, nine hundred forty-four thousand, six hundred eighty-one".