11881845 has 24 divisors (see below), whose sum is σ = 20883096. Its totient is φ = 6248448.

The previous prime is 11881843. The next prime is 11881853. The reversal of 11881845 is 54818811.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36 + 11881809 = 6^2 + 3447^2 .

It is not a de Polignac number, because 11881845 - 2¹ = 11881843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11881843) 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, 1477 + ... + 5093.

It is an arithmetic number, because the mean of its divisors is an integer number (870129).

Almost surely, 2^11881845 is an apocalyptic number.

11881845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11881845 is a deficient number, since it is larger than the sum of its proper divisors (9001251).

11881845 is a wasteful number, since it uses less digits than its factorization.

11881845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3701 (or 3698 counting only the distinct ones).

The product of its digits is 10240, while the sum is 36.

The square root of 11881845 is about 3447.0052219282. The cubic root of 11881845 is about 228.1889592351.

Subtracting from 11881845 its sum of digits (36), we obtain a square (11881809 = 3447²).

The spelling of 11881845 in words is "eleven million, eight hundred eighty-one thousand, eight hundred forty-five".