18013805 has 8 divisors (see below), whose sum is σ = 22754400. Its totient is φ = 13652496.

The previous prime is 18013781. The next prime is 18013813. The reversal of 18013805 is 50831081.

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 18013805 - 2⁶ = 18013741 is a prime.

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, 94715 + ... + 94904.

It is an arithmetic number, because the mean of its divisors is an integer number (2844300).

Almost surely, 2^18013805 is an apocalyptic number.

It is an amenable number.

18013805 is a deficient number, since it is larger than the sum of its proper divisors (4740595).

18013805 is a wasteful number, since it uses less digits than its factorization.

18013805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189643.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18013805 is about 4244.2673101491. The cubic root of 18013805 is about 262.1411210685.

Adding to 18013805 its reverse (50831081), we get a palindrome (68844886).

The spelling of 18013805 in words is "eighteen million, thirteen thousand, eight hundred five".