11943811 has 4 divisors (see below), whose sum is σ = 13029624. Its totient is φ = 10858000.

The previous prime is 11943791. The next prime is 11943817. The reversal of 11943811 is 11834911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11943811 - 2⁵ = 11943779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11943811.

It is not an unprimeable number, because it can be changed into a prime (11943817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542890 + ... + 542911.

It is an arithmetic number, because the mean of its divisors is an integer number (3257406).

Almost surely, 2^11943811 is an apocalyptic number.

11943811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11943811 is a deficient number, since it is larger than the sum of its proper divisors (1085813).

11943811 is a wasteful number, since it uses less digits than its factorization.

11943811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085812.

The product of its digits is 864, while the sum is 28.

The square root of 11943811 is about 3455.9819154619. The cubic root of 11943811 is about 228.5849540545.

Subtracting from 11943811 its reverse (11834911), we obtain a square (108900 = 330²).

It can be divided in two parts, 1194 and 3811, that added together give a palindrome (5005).

The spelling of 11943811 in words is "eleven million, nine hundred forty-three thousand, eight hundred eleven".