18812005 has 8 divisors (see below), whose sum is σ = 22701600. Its totient is φ = 14964816.

The previous prime is 18811997. The next prime is 18812051. The reversal of 18812005 is 50021881.

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 18812005 - 2³ = 18811997 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, 9615 + ... + 11404.

It is an arithmetic number, because the mean of its divisors is an integer number (2837700).

Almost surely, 2^18812005 is an apocalyptic number.

It is an amenable number.

18812005 is a deficient number, since it is larger than the sum of its proper divisors (3889595).

18812005 is a wasteful number, since it uses less digits than its factorization.

18812005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21203.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 18812005 is about 4337.2808301976. The cubic root of 18812005 is about 265.9571651680.

Adding to 18812005 its reverse (50021881), we get a palindrome (68833886).

The spelling of 18812005 in words is "eighteen million, eight hundred twelve thousand, five".