18244281 has 24 divisors (see below), whose sum is σ = 28204704. Its totient is φ = 10401280.

The previous prime is 18244279. The next prime is 18244333.

18244281 = 93² + 94² + ... + 381².

18244281 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18244281 - 2¹ = 18244279 is a prime.

It is a super-2 number, since 2×18244281² = 665707578413922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18244211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8581 + ... + 10493.

It is an arithmetic number, because the mean of its divisors is an integer number (1175196).

Almost surely, 2^18244281 is an apocalyptic number.

18244281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18244281 is a deficient number, since it is larger than the sum of its proper divisors (9960423).

18244281 is a wasteful number, since it uses less digits than its factorization.

18244281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961 (or 1944 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 18244281 is about 4271.3324618906. The cubic root of 18244281 is about 263.2543670007.

It can be divided in two parts, 1824 and 4281, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 18244281 in words is "eighteen million, two hundred forty-four thousand, two hundred eighty-one".