1138221 has 36 divisors (see below), whose sum is σ = 2000700. Its totient is φ = 620928.

The previous prime is 1138213. The next prime is 1138237. The reversal of 1138221 is 1228311.

It can be written as a sum of positive squares in 2 ways, for example, as 396900 + 741321 = 630^2 + 861^2 .

It is not a de Polignac number, because 1138221 - 2³ = 1138213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1138194 and 1138203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1136221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12745 + ... + 12833.

It is an arithmetic number, because the mean of its divisors is an integer number (55575).

2^1138221 is an apocalyptic number.

It is an amenable number.

1138221 is a deficient number, since it is larger than the sum of its proper divisors (862479).

1138221 is a wasteful number, since it uses less digits than its factorization.

1138221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 128 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1138221 is about 1066.8744068540. The cubic root of 1138221 is about 104.4100245802.

The spelling of 1138221 in words is "one million, one hundred thirty-eight thousand, two hundred twenty-one".