1221733 has 4 divisors (see below), whose sum is σ = 1225548. Its totient is φ = 1217920.

The previous prime is 1221707. The next prime is 1221749. The reversal of 1221733 is 3371221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 362404 + 859329 = 602^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221733 - 2⁹ = 1221221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (306387).

2^1221733 is an apocalyptic number.

It is an amenable number.

1221733 is a deficient number, since it is larger than the sum of its proper divisors (3815).

1221733 is an equidigital number, since it uses as much as digits as its factorization.

1221733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814.

The product of its digits is 252, while the sum is 19.

The square root of 1221733 is about 1105.3203155647. The cubic root of 1221733 is about 106.9035436681.

Adding to 1221733 its reverse (3371221), we get a palindrome (4592954).

The spelling of 1221733 in words is "one million, two hundred twenty-one thousand, seven hundred thirty-three".