11910939840 has 280 divisors, whose sum is σ = 44863280352. Its totient is φ = 2989301760.

The previous prime is 11910939779. The next prime is 11910939847. The reversal of 11910939840 is 4893901911.

11910939840 is a `hidden beast` number, since 119 + 109 + 398 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (11910939847) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 427125 + ... + 454155.

Almost surely, 2^11910939840 is an apocalyptic number.

11910939840 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 11910939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22431640176).

11910939840 is an abundant number, since it is smaller than the sum of its proper divisors (32952340512).

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

11910939840 is a wasteful number, since it uses less digits than its factorization.

11910939840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27077 (or 27058 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The spelling of 11910939840 in words is "eleven billion, nine hundred ten million, nine hundred thirty-nine thousand, eight hundred forty".