11809816 has 8 divisors (see below), whose sum is σ = 22143420. Its totient is φ = 5904904.

The previous prime is 11809807. The next prime is 11809817. The reversal of 11809816 is 61890811.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11809817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 738106 + ... + 738121.

Almost surely, 2^11809816 is an apocalyptic number.

It is an amenable number.

11809816 is a deficient number, since it is larger than the sum of its proper divisors (10333604).

11809816 is a wasteful number, since it uses less digits than its factorization.

11809816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476233 (or 1476229 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 11809816 is about 3436.5412844894. The cubic root of 11809816 is about 227.7269224734.

It can be divided in two parts, 118098 and 16, that multiplied together give a 5-th power (1889568 = 18⁵).

The spelling of 11809816 in words is "eleven million, eight hundred nine thousand, eight hundred sixteen".