11939393920 has 64 divisors (see below), whose sum is σ = 28596201840. Its totient is φ = 4766791680.

The previous prime is 11939393911. The next prime is 11939393929. The reversal of 11939393920 is 2939393911.

It is an interprime number because it is at equal distance from previous prime (11939393911) and next prime (11939393929).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11939393929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328999 + ... + 363481.

Almost surely, 2^11939393920 is an apocalyptic number.

11939393920 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 11939393920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14298100920).

11939393920 is an abundant number, since it is smaller than the sum of its proper divisors (16656807920).

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

11939393920 is an equidigital number, since it uses as much as digits as its factorization.

11939393920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35043 (or 35031 counting only the distinct ones).

The product of its (nonzero) digits is 354294, while the sum is 49.

Subtracting from 11939393920 its reverse (2939393911), we obtain a palindrome (9000000009).

The spelling of 11939393920 in words is "eleven billion, nine hundred thirty-nine million, three hundred ninety-three thousand, nine hundred twenty".