18774081 has 6 divisors (see below), whose sum is σ = 27118130. Its totient is φ = 12516048.

The previous prime is 18774073. The next prime is 18774083. The reversal of 18774081 is 18047781.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 2005056 = 4095^2 + 1416^2 .

It is not a de Polignac number, because 18774081 - 2³ = 18774073 is a prime.

It is a super-2 number, since 2×18774081² = 704932234789122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18774083) 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 5 ways as a sum of consecutive naturals, for example, 1042996 + ... + 1043013.

Almost surely, 2^18774081 is an apocalyptic number.

It is an amenable number.

18774081 is a deficient number, since it is larger than the sum of its proper divisors (8344049).

18774081 is a wasteful number, since it uses less digits than its factorization.

18774081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2086015 (or 2086012 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 18774081 is about 4332.9067610554. The cubic root of 18774081 is about 265.7783264451.

The spelling of 18774081 in words is "eighteen million, seven hundred seventy-four thousand, eighty-one".