18081693 has 24 divisors (see below), whose sum is σ = 31606848. Its totient is φ = 9724032.

The previous prime is 18081691. The next prime is 18081733. The reversal of 18081693 is 39618081.

It is not a de Polignac number, because 18081693 - 2¹ = 18081691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7371 + ... + 9512.

It is an arithmetic number, because the mean of its divisors is an integer number (1316952).

Almost surely, 2^18081693 is an apocalyptic number.

It is an amenable number.

18081693 is a deficient number, since it is larger than the sum of its proper divisors (13525155).

18081693 is a wasteful number, since it uses less digits than its factorization.

18081693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16913 (or 16910 counting only the distinct ones).

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

The square root of 18081693 is about 4252.2574004874. The cubic root of 18081693 is about 262.4700156227.

The spelling of 18081693 in words is "eighteen million, eighty-one thousand, six hundred ninety-three".