18940081 has 8 divisors (see below), whose sum is σ = 19515584. Its totient is φ = 18370800.

The previous prime is 18940079. The next prime is 18940127. The reversal of 18940081 is 18004981.

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 18940081 - 2¹ = 18940079 is a prime.

It is a super-2 number, since 2×18940081² = 717453336573122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18943081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5035 + ... + 7951.

It is an arithmetic number, because the mean of its divisors is an integer number (2439448).

Almost surely, 2^18940081 is an apocalyptic number.

It is an amenable number.

18940081 is a deficient number, since it is larger than the sum of its proper divisors (575503).

18940081 is a wasteful number, since it uses less digits than its factorization.

18940081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18940081 is about 4352.0203354304. The cubic root of 18940081 is about 266.5593642943.

The spelling of 18940081 in words is "eighteen million, nine hundred forty thousand, eighty-one".