11389721 has 16 divisors (see below), whose sum is σ = 14179200. Its totient is φ = 8926848.

The previous prime is 11389717. The next prime is 11389723. The reversal of 11389721 is 12798311.

It is not a de Polignac number, because 11389721 - 2² = 11389717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11389723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2381 + ... + 5333.

It is an arithmetic number, because the mean of its divisors is an integer number (886200).

Almost surely, 2^11389721 is an apocalyptic number.

It is an amenable number.

11389721 is a deficient number, since it is larger than the sum of its proper divisors (2789479).

11389721 is a wasteful number, since it uses less digits than its factorization.

11389721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008.

The product of its digits is 3024, while the sum is 32.

The square root of 11389721 is about 3374.8660714168. The cubic root of 11389721 is about 224.9940475792.

The spelling of 11389721 in words is "eleven million, three hundred eighty-nine thousand, seven hundred twenty-one".