18306481 has 4 divisors (see below), whose sum is σ = 19270000. Its totient is φ = 17342964.

The previous prime is 18306473. The next prime is 18306493. The reversal of 18306481 is 18460381.

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.

It is a cyclic number.

It is not a de Polignac number, because 18306481 - 2³ = 18306473 is a prime.

It is a super-2 number, since 2×18306481² = 670254493206722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18306451) 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 3 ways as a sum of consecutive naturals, for example, 481731 + ... + 481768.

It is an arithmetic number, because the mean of its divisors is an integer number (4817500).

Almost surely, 2^18306481 is an apocalyptic number.

It is an amenable number.

18306481 is a deficient number, since it is larger than the sum of its proper divisors (963519).

18306481 is an equidigital number, since it uses as much as digits as its factorization.

18306481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963518.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18306481 is about 4278.6073668894. The cubic root of 18306481 is about 263.5531976027.

The spelling of 18306481 in words is "eighteen million, three hundred six thousand, four hundred eighty-one".