18035881 has 4 divisors (see below), whose sum is σ = 18076500. Its totient is φ = 17995264.

The previous prime is 18035879. The next prime is 18035911. The reversal of 18035881 is 18853081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18853081 = 13 ⋅1450237.

It can be written as a sum of positive squares in 2 ways, for example, as 15280281 + 2755600 = 3909^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 18035881 - 2¹ = 18035879 is a prime.

It is a super-2 number, since 2×18035881² = 650586006892322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18035821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19636 + ... + 20533.

It is an arithmetic number, because the mean of its divisors is an integer number (4519125).

Almost surely, 2^18035881 is an apocalyptic number.

It is an amenable number.

18035881 is a deficient number, since it is larger than the sum of its proper divisors (40619).

18035881 is an equidigital number, since it uses as much as digits as its factorization.

18035881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40618.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 18035881 is about 4246.8671983004. The cubic root of 18035881 is about 262.2481623994.

The spelling of 18035881 in words is "eighteen million, thirty-five thousand, eight hundred eighty-one".