11913009920 has 216 divisors, whose sum is σ = 33180546336. Its totient is φ = 4014342144.

The previous prime is 11913009907. The next prime is 11913009923. The reversal of 11913009920 is 2990031911.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (11913009923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61725344 + ... + 61725536.

Almost surely, 2^11913009920 is an apocalyptic number.

11913009920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11913009920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16590273168).

11913009920 is an abundant number, since it is smaller than the sum of its proper divisors (21267536416).

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

11913009920 is an frugal number, since it uses more digits than its factorization.

11913009920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 35.

The spelling of 11913009920 in words is "eleven billion, nine hundred thirteen million, nine thousand, nine hundred twenty".