11951738388 has 72 divisors (see below), whose sum is σ = 31293190656. Its totient is φ = 3842136000.

The previous prime is 11951738387. The next prime is 11951738417. The reversal of 11951738388 is 88383715911.

It is a happy number.

11951738388 is a `hidden beast` number, since 1 + 1 + 95 + 173 + 8 + 388 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11951738387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308713 + ... + 345263.

It is an arithmetic number, because the mean of its divisors is an integer number (434627648).

Almost surely, 2^11951738388 is an apocalyptic number.

11951738388 is a gapful number since it is divisible by the number (18) 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 11951738388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15646595328).

11951738388 is an abundant number, since it is smaller than the sum of its proper divisors (19341452268).

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

11951738388 is a wasteful number, since it uses less digits than its factorization.

11951738388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36885 (or 36880 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The spelling of 11951738388 in words is "eleven billion, nine hundred fifty-one million, seven hundred thirty-eight thousand, three hundred eighty-eight".