11438721 has 24 divisors (see below), whose sum is σ = 19495424. Its totient is φ = 6324480.

The previous prime is 11438717. The next prime is 11438729. The reversal of 11438721 is 12783411.

11438721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11438721 - 2² = 11438717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11438729) 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, 976 + ... + 4881.

Almost surely, 2^11438721 is an apocalyptic number.

11438721 is the 1953-rd octagonal number.

It is an amenable number.

11438721 is a deficient number, since it is larger than the sum of its proper divisors (8056703).

11438721 is a wasteful number, since it uses less digits than its factorization.

11438721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5901 (or 5898 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 11438721 is about 3382.1178276340. The cubic root of 11438721 is about 225.3162368034.

The spelling of 11438721 in words is "eleven million, four hundred thirty-eight thousand, seven hundred twenty-one".