11813940 has 36 divisors (see below), whose sum is σ = 35836164. Its totient is φ = 3150336.

The previous prime is 11813939. The next prime is 11813947. The reversal of 11813940 is 4931811.

It can be written as a sum of positive squares in 2 ways, for example, as 6533136 + 5280804 = 2556^2 + 2298^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11813947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32637 + ... + 32996.

It is an arithmetic number, because the mean of its divisors is an integer number (995449).

Almost surely, 2^11813940 is an apocalyptic number.

11813940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11813940 is an abundant number, since it is smaller than the sum of its proper divisors (24022224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11813940 is a wasteful number, since it uses less digits than its factorization.

11813940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65648 (or 65643 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 11813940 is about 3437.1412540075. The cubic root of 11813940 is about 227.7534268810.

The spelling of 11813940 in words is "eleven million, eight hundred thirteen thousand, nine hundred forty".