18274981 has 4 divisors (see below), whose sum is σ = 18452512. Its totient is φ = 18097452.

The previous prime is 18274969. The next prime is 18275011. The reversal of 18274981 is 18947281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18274981 is a prime.

It is a super-2 number, since 2×18274981² = 667949861100722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18274931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88611 + ... + 88816.

It is an arithmetic number, because the mean of its divisors is an integer number (4613128).

Almost surely, 2^18274981 is an apocalyptic number.

It is an amenable number.

18274981 is a deficient number, since it is larger than the sum of its proper divisors (177531).

18274981 is a wasteful number, since it uses less digits than its factorization.

18274981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177530.

The product of its digits is 32256, while the sum is 40.

The square root of 18274981 is about 4274.9246776990. The cubic root of 18274981 is about 263.4019453040.

The spelling of 18274981 in words is "eighteen million, two hundred seventy-four thousand, nine hundred eighty-one".