11721654 has 48 divisors (see below), whose sum is σ = 29746080. Its totient is φ = 3265920.

The previous prime is 11721649. The next prime is 11721667. The reversal of 11721654 is 45612711.

It is a happy number.

11721654 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 1 + 654 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4032 + ... + 6300.

It is an arithmetic number, because the mean of its divisors is an integer number (619710).

Almost surely, 2^11721654 is an apocalyptic number.

11721654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11721654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14873040).

11721654 is an abundant number, since it is smaller than the sum of its proper divisors (18024426).

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

11721654 is a wasteful number, since it uses less digits than its factorization.

11721654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325 (or 2322 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 11721654 is about 3423.6901144817. The cubic root of 11721654 is about 227.1588349302.

The spelling of 11721654 in words is "eleven million, seven hundred twenty-one thousand, six hundred fifty-four".