18412681 has 9 divisors (see below), whose sum is σ = 21453831. Its totient is φ = 15756552.

The previous prime is 18412679. The next prime is 18412687. The reversal of 18412681 is 18621481.

The square root of 18412681 is 4291.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 60025 + 18352656 = 245^2 + 4284^2 .

It is not a de Polignac number, because 18412681 - 2¹ = 18412679 is a prime.

It is a super-2 number, since 2×18412681² = 678053643215522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18412687) 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 8 ways as a sum of consecutive naturals, for example, 29731 + ... + 30343.

It is an arithmetic number, because the mean of its divisors is an integer number (2383759).

Almost surely, 2^18412681 is an apocalyptic number.

18412681 is the 4291-st square number.

18412681 is the 2146-th centered octagonal number.

It is an amenable number.

18412681 is a deficient number, since it is larger than the sum of its proper divisors (3041150).

18412681 is an frugal number, since it uses more digits than its factorization.

18412681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 620 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The cubic root of 18412681 is about 264.0618589740.

The spelling of 18412681 in words is "eighteen million, four hundred twelve thousand, six hundred eighty-one".