11990805 has 16 divisors (see below), whose sum is σ = 20195520. Its totient is φ = 6058368.

The previous prime is 11990801. The next prime is 11990813. The reversal of 11990805 is 50809911.

It is not a de Polignac number, because 11990805 - 2² = 11990801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11990801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20752 + ... + 21321.

It is an arithmetic number, because the mean of its divisors is an integer number (1262220).

Almost surely, 2^11990805 is an apocalyptic number.

11990805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11990805 is a deficient number, since it is larger than the sum of its proper divisors (8204715).

11990805 is a wasteful number, since it uses less digits than its factorization.

11990805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42100.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 11990805 is about 3462.7741768703. The cubic root of 11990805 is about 228.8843577494.

The spelling of 11990805 in words is "eleven million, nine hundred ninety thousand, eight hundred five".