18086261 has 8 divisors (see below), whose sum is σ = 18510360. Its totient is φ = 17667072.

The previous prime is 18086251. The next prime is 18086279. The reversal of 18086261 is 16268081.

It can be written as a sum of positive squares in 4 ways, for example, as 8439025 + 9647236 = 2905^2 + 3106^2 .

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 18086261 - 2¹⁰ = 18085237 is a prime.

It is a super-2 number, since 2×18086261² = 654225673920242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18086221) 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, 6821 + ... + 9093.

It is an arithmetic number, because the mean of its divisors is an integer number (2313795).

Almost surely, 2^18086261 is an apocalyptic number.

It is an amenable number.

18086261 is a deficient number, since it is larger than the sum of its proper divisors (424099).

18086261 is a wasteful number, since it uses less digits than its factorization.

18086261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18086261 is about 4252.7944930363. The cubic root of 18086261 is about 262.4921164677.

The spelling of 18086261 in words is "eighteen million, eighty-six thousand, two hundred sixty-one".