1243421 has 2 divisors, whose sum is σ = 1243422. Its totient is φ = 1243420.

The previous prime is 1243393. The next prime is 1243427.

1243421 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 196 = 1115^2 + 14^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621710 + 621711.

It is an arithmetic number, because the mean of its divisors is an integer number (621711).

2^1243421 is an apocalyptic number.

It is an amenable number.

1243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243421 is an equidigital number, since it uses as much as digits as its factorization.

1243421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 17.

The square root of 1243421 is about 1115.0878889128. The cubic root of 1243421 is about 107.5324149589.

The spelling of 1243421 in words is "one million, two hundred forty-three thousand, four hundred twenty-one".