11890805 has 8 divisors (see below), whose sum is σ = 14311512. Its totient is φ = 9484288.

The previous prime is 11890799. The next prime is 11890807. The reversal of 11890805 is 50809811.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 908209 + 10982596 = 953^2 + 3314^2 .

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 11890805 - 2⁶ = 11890741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11890807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604 + ... + 5133.

It is an arithmetic number, because the mean of its divisors is an integer number (1788939).

Almost surely, 2^11890805 is an apocalyptic number.

It is an amenable number.

11890805 is a deficient number, since it is larger than the sum of its proper divisors (2420707).

11890805 is an equidigital number, since it uses as much as digits as its factorization.

11890805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7095.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 11890805 is about 3448.3046559143. The cubic root of 11890805 is about 228.2463032855.

The spelling of 11890805 in words is "eleven million, eight hundred ninety thousand, eight hundred five".