18261745 has 8 divisors (see below), whose sum is σ = 21939840. Its totient is φ = 14592240.

The previous prime is 18261731. The next prime is 18261767. The reversal of 18261745 is 54716281.

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

It is not a de Polignac number, because 18261745 - 2¹³ = 18253553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18261745.

It is an unprimeable number.

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, 4296 + ... + 7414.

It is an arithmetic number, because the mean of its divisors is an integer number (2742480).

Almost surely, 2^18261745 is an apocalyptic number.

It is an amenable number.

18261745 is a deficient number, since it is larger than the sum of its proper divisors (3678095).

18261745 is a wasteful number, since it uses less digits than its factorization.

18261745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295.

The product of its digits is 13440, while the sum is 34.

The square root of 18261745 is about 4273.3762998360. The cubic root of 18261745 is about 263.3383386682.

The spelling of 18261745 in words is "eighteen million, two hundred sixty-one thousand, seven hundred forty-five".