11800005 has 32 divisors (see below), whose sum is σ = 22111488. Its totient is φ = 5260800.

The previous prime is 11800001. The next prime is 11800037. The reversal of 11800005 is 50000811.

It is a happy number.

It is not a de Polignac number, because 11800005 - 2² = 11800001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11800001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2935 + ... + 5675.

It is an arithmetic number, because the mean of its divisors is an integer number (690984).

Almost surely, 2^11800005 is an apocalyptic number.

11800005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11800005 is a deficient number, since it is larger than the sum of its proper divisors (10311483).

11800005 is a wasteful number, since it uses less digits than its factorization.

11800005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 11800005 is about 3435.1135352416. The cubic root of 11800005 is about 227.6638436522.

Adding to 11800005 its reverse (50000811), we get a palindrome (61800816).

The spelling of 11800005 in words is "eleven million, eight hundred thousand, five".