18806535 has 24 divisors (see below), whose sum is σ = 35562384. Its totient is φ = 9118080.

The previous prime is 18806531. The next prime is 18806549. The reversal of 18806535 is 53560881.

It is not a de Polignac number, because 18806535 - 2² = 18806531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18806535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18806531) 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, 18502 + ... + 19491.

It is an arithmetic number, because the mean of its divisors is an integer number (1481766).

Almost surely, 2^18806535 is an apocalyptic number.

18806535 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18806535 is a deficient number, since it is larger than the sum of its proper divisors (16755849).

18806535 is a wasteful number, since it uses less digits than its factorization.

18806535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38015 (or 38012 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18806535 is about 4336.6502049393. The cubic root of 18806535 is about 265.9313850572.

The spelling of 18806535 in words is "eighteen million, eight hundred six thousand, five hundred thirty-five".