11732721 has 32 divisors (see below), whose sum is σ = 21009408. Its totient is φ = 5624640.

The previous prime is 11732717. The next prime is 11732723. The reversal of 11732721 is 12723711.

11732721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11732721 - 2² = 11732717 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11732691 and 11732700.

It is not an unprimeable number, because it can be changed into a prime (11732723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050 + ... + 4956.

It is an arithmetic number, because the mean of its divisors is an integer number (656544).

Almost surely, 2^11732721 is an apocalyptic number.

11732721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11732721 is a deficient number, since it is larger than the sum of its proper divisors (9276687).

11732721 is a wasteful number, since it uses less digits than its factorization.

11732721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941.

The product of its digits is 588, while the sum is 24.

The square root of 11732721 is about 3425.3059717345. The cubic root of 11732721 is about 227.2303031165.

The spelling of 11732721 in words is "eleven million, seven hundred thirty-two thousand, seven hundred twenty-one".