1247321 has 2 divisors, whose sum is σ = 1247322. Its totient is φ = 1247320.

The previous prime is 1247317. The next prime is 1247327. The reversal of 1247321 is 1237421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 4096 = 1115^2 + 64^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247321 - 2² = 1247317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1247293 and 1247302.

It is not a weakly prime, because it can be changed into another prime (1247327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623660 + 623661.

It is an arithmetic number, because the mean of its divisors is an integer number (623661).

2^1247321 is an apocalyptic number.

It is an amenable number.

1247321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247321 is an equidigital number, since it uses as much as digits as its factorization.

1247321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 1247321 is about 1116.8352609047. The cubic root of 1247321 is about 107.6447230513.

The spelling of 1247321 in words is "one million, two hundred forty-seven thousand, three hundred twenty-one".