18326961 has 9 divisors (see below), whose sum is σ = 26490841. Its totient is φ = 12209412.

The previous prime is 18326911. The next prime is 18326977. The reversal of 18326961 is 16962381.

The square root of 18326961 is 4281.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18326961 - 2¹¹ = 18324913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18326911) 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 8 ways as a sum of consecutive naturals, for example, 12130 + ... + 13556.

Almost surely, 2^18326961 is an apocalyptic number.

18326961 is the 4281-st square number.

18326961 is the 2141-st centered octagonal number.

It is an amenable number.

18326961 is a deficient number, since it is larger than the sum of its proper divisors (8163880).

18326961 is an frugal number, since it uses more digits than its factorization.

18326961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860 (or 1430 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The cubic root of 18326961 is about 263.6514425527.

Multiplying 18326961 by its sum of digits (36), we get a square (659770596 = 25686²).

The spelling of 18326961 in words is "eighteen million, three hundred twenty-six thousand, nine hundred sixty-one".