11393721 has 6 divisors (see below), whose sum is σ = 16457610. Its totient is φ = 7595808.

The previous prime is 11393719. The next prime is 11393729. The reversal of 11393721 is 12739311.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 404496 = 3315^2 + 636^2 .

It is not a de Polignac number, because 11393721 - 2¹ = 11393719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11393729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 632976 + ... + 632993.

It is an arithmetic number, because the mean of its divisors is an integer number (2742935).

Almost surely, 2^11393721 is an apocalyptic number.

It is an amenable number.

11393721 is a deficient number, since it is larger than the sum of its proper divisors (5063889).

11393721 is a wasteful number, since it uses less digits than its factorization.

11393721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265975 (or 1265972 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 11393721 is about 3375.4586355042. The cubic root of 11393721 is about 225.0203833385.

The spelling of 11393721 in words is "eleven million, three hundred ninety-three thousand, seven hundred twenty-one".