1245421 has 2 divisors, whose sum is σ = 1245422. Its totient is φ = 1245420.

The previous prime is 1245401. The next prime is 1245449.

1245421 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 504100 = 861^2 + 710^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1245421 - 2⁹ = 1244909 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 (1245401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622710 + 622711.

It is an arithmetic number, because the mean of its divisors is an integer number (622711).

2^1245421 is an apocalyptic number.

It is an amenable number.

1245421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245421 is an equidigital number, since it uses as much as digits as its factorization.

1245421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 19.

The square root of 1245421 is about 1115.9843188862. The cubic root of 1245421 is about 107.5900381411.

The spelling of 1245421 in words is "one million, two hundred forty-five thousand, four hundred twenty-one".