1233721 has 2 divisors, whose sum is σ = 1233722. Its totient is φ = 1233720.

The previous prime is 1233709. The next prime is 1233751. The reversal of 1233721 is 1273321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 211600 = 1011^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 1233721 - 2⁷ = 1233593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1233751) 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 as a sum of consecutive naturals, namely, 616860 + 616861.

It is an arithmetic number, because the mean of its divisors is an integer number (616861).

2^1233721 is an apocalyptic number.

It is an amenable number.

1233721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1233721 is an equidigital number, since it uses as much as digits as its factorization.

1233721 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1233721 is about 1110.7299401745. The cubic root of 1233721 is about 107.2520624537.

It can be divided in two parts, 123 and 3721, that added together give a square (3844 = 62²).

The spelling of 1233721 in words is "one million, two hundred thirty-three thousand, seven hundred twenty-one".