18026081 has 8 divisors (see below), whose sum is σ = 18760680. Its totient is φ = 17299072.

The previous prime is 18026059. The next prime is 18026087. The reversal of 18026081 is 18062081.

It can be written as a sum of positive squares in 4 ways, for example, as 4950625 + 13075456 = 2225^2 + 3616^2 .

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 18026081 - 2¹⁸ = 17763937 is a prime.

It is a super-2 number, since 2×18026081² = 649879192437122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18026081.

It is not an unprimeable number, because it can be changed into a prime (18026087) 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, 3221 + ... + 6813.

It is an arithmetic number, because the mean of its divisors is an integer number (2345085).

Almost surely, 2^18026081 is an apocalyptic number.

It is an amenable number.

18026081 is a deficient number, since it is larger than the sum of its proper divisors (734599).

18026081 is a wasteful number, since it uses less digits than its factorization.

18026081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3795.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 18026081 is about 4245.7132498557. The cubic root of 18026081 is about 262.2006552918.

The spelling of 18026081 in words is "eighteen million, twenty-six thousand, eighty-one".