1297421 has 2 divisors, whose sum is σ = 1297422. Its totient is φ = 1297420.

The previous prime is 1297411. The next prime is 1297447. The reversal of 1297421 is 1247921.

It is an a-pointer prime, because the next prime (1297447) can be obtained adding 1297421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 100 = 1139^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297421 - 2⁶ = 1297357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648710 + 648711.

It is an arithmetic number, because the mean of its divisors is an integer number (648711).

2^1297421 is an apocalyptic number.

It is an amenable number.

1297421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297421 is an equidigital number, since it uses as much as digits as its factorization.

1297421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 1297421 is about 1139.0438973104. The cubic root of 1297421 is about 109.0670686750.

The spelling of 1297421 in words is "one million, two hundred ninety-seven thousand, four hundred twenty-one".