18086913 has 12 divisors (see below), whose sum is σ = 28135380. Its totient is φ = 11130336.

The previous prime is 18086899. The next prime is 18086933. The reversal of 18086913 is 31968081.

It can be written as a sum of positive squares in 2 ways, for example, as 6411024 + 11675889 = 2532^2 + 3417^2 .

It is not a de Polignac number, because 18086913 - 2⁴ = 18086897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18086933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77178 + ... + 77411.

It is an arithmetic number, because the mean of its divisors is an integer number (2344615).

Almost surely, 2^18086913 is an apocalyptic number.

18086913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18086913 is a deficient number, since it is larger than the sum of its proper divisors (10048467).

18086913 is a wasteful number, since it uses less digits than its factorization.

18086913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154608 (or 154605 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18086913 is about 4252.8711478247. The cubic root of 18086913 is about 262.4952706631.

The spelling of 18086913 in words is "eighteen million, eighty-six thousand, nine hundred thirteen".