18073261 has 8 divisors (see below), whose sum is σ = 19211904. Its totient is φ = 16943040.

The previous prime is 18073259. The next prime is 18073271. The reversal of 18073261 is 16237081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18073261 - 2¹ = 18073259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18073271) 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 7 ways as a sum of consecutive naturals, for example, 2646 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (2401488).

Almost surely, 2^18073261 is an apocalyptic number.

It is an amenable number.

18073261 is a deficient number, since it is larger than the sum of its proper divisors (1138643).

18073261 is a wasteful number, since it uses less digits than its factorization.

18073261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 18073261 is about 4251.2658114966. The cubic root of 18073261 is about 262.4292102388.

It can be divided in two parts, 180 and 73261, that added together give a square (73441 = 271²).

The spelling of 18073261 in words is "eighteen million, seventy-three thousand, two hundred sixty-one".