11951838720 has 120 divisors (see below), whose sum is σ = 41392658736. Its totient is φ = 3187150848.

The previous prime is 11951838719. The next prime is 11951838721. The reversal of 11951838720 is 2783815911.

It is an interprime number because it is at equal distance from previous prime (11951838719) and next prime (11951838721).

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11951838721) 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 11 ways as a sum of consecutive naturals, for example, 236332 + ... + 282411.

Almost surely, 2^11951838720 is an apocalyptic number.

11951838720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11951838720 is an abundant number, since it is smaller than the sum of its proper divisors (29440820016).

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

11951838720 is an equidigital number, since it uses as much as digits as its factorization.

11951838720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518772 (or 518753 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 11951838720 in words is "eleven billion, nine hundred fifty-one million, eight hundred thirty-eight thousand, seven hundred twenty".