11721798 has 48 divisors (see below), whose sum is σ = 28254096. Its totient is φ = 3481920.

The previous prime is 11721797. The next prime is 11721799. The reversal of 11721798 is 89712711.

11721798 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11721797) and next prime (11721799).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721791) 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, 9936 + ... + 11052.

It is an arithmetic number, because the mean of its divisors is an integer number (588627).

Almost surely, 2^11721798 is an apocalyptic number.

11721798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11721798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14127048).

11721798 is an abundant number, since it is smaller than the sum of its proper divisors (16532298).

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

11721798 is a wasteful number, since it uses less digits than its factorization.

11721798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189 (or 1186 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 11721798 is about 3423.7111443578. The cubic root of 11721798 is about 227.1597651385.

The spelling of 11721798 in words is "eleven million, seven hundred twenty-one thousand, seven hundred ninety-eight".