18334981 has 16 divisors (see below), whose sum is σ = 22773760. Its totient is φ = 14405040.

The previous prime is 18334973. The next prime is 18334991. The reversal of 18334981 is 18943381.

It is not a de Polignac number, because 18334981 - 2³ = 18334973 is a prime.

It is a super-2 number, since 2×18334981² = 672343056540722, 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 18334981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18334951) 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 15 ways as a sum of consecutive naturals, for example, 1900 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (1423360).

Almost surely, 2^18334981 is an apocalyptic number.

It is an amenable number.

18334981 is a deficient number, since it is larger than the sum of its proper divisors (4438779).

18334981 is a wasteful number, since it uses less digits than its factorization.

18334981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504.

The product of its digits is 20736, while the sum is 37.

The square root of 18334981 is about 4281.9365945796. The cubic root of 18334981 is about 263.6898954856.

Subtracting 18334981 from its reverse (18943381), we obtain a square (608400 = 780²).

The spelling of 18334981 in words is "eighteen million, three hundred thirty-four thousand, nine hundred eighty-one".