1421309 has 2 divisors, whose sum is σ = 1421310. Its totient is φ = 1421308.

The previous prime is 1421293. The next prime is 1421317. The reversal of 1421309 is 9031241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 178084 = 1115^2 + 422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421309 - 2⁴ = 1421293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710654 + 710655.

It is an arithmetic number, because the mean of its divisors is an integer number (710655).

2^1421309 is an apocalyptic number.

It is an amenable number.

1421309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421309 is an equidigital number, since it uses as much as digits as its factorization.

1421309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1421309 is about 1192.1866464610. The cubic root of 1421309 is about 112.4336135078.

The spelling of 1421309 in words is "one million, four hundred twenty-one thousand, three hundred nine".