18260665 has 8 divisors (see below), whose sum is σ = 21935880. Its totient is φ = 14593152.

The previous prime is 18260663. The next prime is 18260713. The reversal of 18260665 is 56606281.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 17943696 = 563^2 + 4236^2 .

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 18260665 - 2¹ = 18260663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18260665.

It is not an unprimeable number, because it can be changed into a prime (18260663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7477 + ... + 9613.

It is an arithmetic number, because the mean of its divisors is an integer number (2741985).

Almost surely, 2^18260665 is an apocalyptic number.

18260665 is the 2137-th decagonal number.

It is an amenable number.

18260665 is a deficient number, since it is larger than the sum of its proper divisors (3675215).

18260665 is a wasteful number, since it uses less digits than its factorization.

18260665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18260665 is about 4273.2499341836. The cubic root of 18260665 is about 263.3331472875. Note that the first 3 decimals are identical.

The spelling of 18260665 in words is "eighteen million, two hundred sixty thousand, six hundred sixty-five".