18810805 has 8 divisors (see below), whose sum is σ = 24309432. Its totient is φ = 13891008.

The previous prime is 18810797. The next prime is 18810829. The reversal of 18810805 is 50801881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1313316 + 17497489 = 1146^2 + 4183^2 .

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 18810805 - 2³ = 18810797 is a prime.

It is a Duffinian number.

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, 144634 + ... + 144763.

It is an arithmetic number, because the mean of its divisors is an integer number (3038679).

Almost surely, 2^18810805 is an apocalyptic number.

It is an amenable number.

18810805 is a deficient number, since it is larger than the sum of its proper divisors (5498627).

18810805 is a wasteful number, since it uses less digits than its factorization.

18810805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289415.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 18810805 is about 4337.1424924713. The cubic root of 18810805 is about 265.9515099958.

The spelling of 18810805 in words is "eighteen million, eight hundred ten thousand, eight hundred five".