11887919540 has 48 divisors (see below), whose sum is σ = 29514844800. Its totient is φ = 3935309952.

The previous prime is 11887919509. The next prime is 11887919543. The reversal of 11887919540 is 4591978811.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11887919543) 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, 1459970 + ... + 1468089.

It is an arithmetic number, because the mean of its divisors is an integer number (614892600).

Almost surely, 2^11887919540 is an apocalyptic number.

11887919540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11887919540 is an abundant number, since it is smaller than the sum of its proper divisors (17626925260).

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

11887919540 is a wasteful number, since it uses less digits than its factorization.

11887919540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928104 (or 2928102 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 11887919540 in words is "eleven billion, eight hundred eighty-seven million, nine hundred nineteen thousand, five hundred forty".