18362881 has 4 divisors (see below), whose sum is σ = 18955264. Its totient is φ = 17770500.

The previous prime is 18362879. The next prime is 18362899. The reversal of 18362881 is 18826381.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18826381 = 7 ⋅2689483.

It is a cyclic number.

It is not a de Polignac number, because 18362881 - 2¹ = 18362879 is a prime.

It is a super-2 number, since 2×18362881² = 674390797240322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18362881.

It is not an unprimeable number, because it can be changed into a prime (18362821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296145 + ... + 296206.

It is an arithmetic number, because the mean of its divisors is an integer number (4738816).

Almost surely, 2^18362881 is an apocalyptic number.

It is an amenable number.

18362881 is a deficient number, since it is larger than the sum of its proper divisors (592383).

18362881 is an equidigital number, since it uses as much as digits as its factorization.

18362881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592382.

The product of its digits is 18432, while the sum is 37.

The square root of 18362881 is about 4285.1932278487. The cubic root of 18362881 is about 263.8235783728.

The spelling of 18362881 in words is "eighteen million, three hundred sixty-two thousand, eight hundred eighty-one".