11853820 has 24 divisors (see below), whose sum is σ = 27156528. Its totient is φ = 4310400.

The previous prime is 11853817. The next prime is 11853839. The reversal of 11853820 is 2835811.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26721 + ... + 27160.

It is an arithmetic number, because the mean of its divisors is an integer number (1131522).

Almost surely, 2^11853820 is an apocalyptic number.

11853820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11853820 is an abundant number, since it is smaller than the sum of its proper divisors (15302708).

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

11853820 is a wasteful number, since it uses less digits than its factorization.

11853820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53901 (or 53899 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 11853820 is about 3442.9376991168. The cubic root of 11853820 is about 228.0094127642.

Subtracting from 11853820 its reverse (2835811), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 1185 and 3820, that added together give a palindrome (5005).

The spelling of 11853820 in words is "eleven million, eight hundred fifty-three thousand, eight hundred twenty".