11931885 has 24 divisors (see below), whose sum is σ = 23637120. Its totient is φ = 5454432.

The previous prime is 11931883. The next prime is 11931889. The reversal of 11931885 is 58813911.

11931885 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11931885 - 2¹ = 11931883 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11931883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18625 + ... + 19254.

It is an arithmetic number, because the mean of its divisors is an integer number (984880).

Almost surely, 2^11931885 is an apocalyptic number.

11931885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11931885 is a deficient number, since it is larger than the sum of its proper divisors (11705235).

11931885 is a wasteful number, since it uses less digits than its factorization.

11931885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37897 (or 37894 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 11931885 is about 3454.2560704152. The cubic root of 11931885 is about 228.5088473576.

The spelling of 11931885 in words is "eleven million, nine hundred thirty-one thousand, eight hundred eighty-five".