18261085 has 8 divisors (see below), whose sum is σ = 21938616. Its totient is φ = 14592000.

The previous prime is 18261073. The next prime is 18261137. The reversal of 18261085 is 58016281.

It can be written as a sum of positive squares in 4 ways, for example, as 1179396 + 17081689 = 1086^2 + 4133^2 .

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

It is not a de Polignac number, because 18261085 - 2¹⁵ = 18228317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4585 + ... + 7585.

It is an arithmetic number, because the mean of its divisors is an integer number (2742327).

Almost surely, 2^18261085 is an apocalyptic number.

It is an amenable number.

18261085 is a deficient number, since it is larger than the sum of its proper divisors (3677531).

18261085 is a wasteful number, since it uses less digits than its factorization.

18261085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 18261085 is about 4273.2990768258. The cubic root of 18261085 is about 263.3351661821.

The spelling of 18261085 in words is "eighteen million, two hundred sixty-one thousand, eighty-five".