11853987820 has 48 divisors (see below), whose sum is σ = 25174806048. Its totient is φ = 4688087040.

The previous prime is 11853987781. The next prime is 11853987823. The reversal of 11853987820 is 2878935811.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11853987823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2502174 + ... + 2506906.

It is an arithmetic number, because the mean of its divisors is an integer number (524475126).

Almost surely, 2^11853987820 is an apocalyptic number.

11853987820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11853987820 is an abundant number, since it is smaller than the sum of its proper divisors (13320818228).

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

11853987820 is a wasteful number, since it uses less digits than its factorization.

11853987820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6130 (or 6128 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 11853987820 in words is "eleven billion, eight hundred fifty-three million, nine hundred eighty-seven thousand, eight hundred twenty".