1297409 has 4 divisors (see below), whose sum is σ = 1318740. Its totient is φ = 1276080.

The previous prime is 1297403. The next prime is 1297411. The reversal of 1297409 is 9047921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9047921 = 41 ⋅220681.

It can be written as a sum of positive squares in 2 ways, for example, as 327184 + 970225 = 572^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297409 - 2⁴ = 1297393 is a prime.

It is a super-2 number, since 2×1297409² = 3366540226562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10574 + ... + 10695.

It is an arithmetic number, because the mean of its divisors is an integer number (329685).

2^1297409 is an apocalyptic number.

It is an amenable number.

1297409 is a deficient number, since it is larger than the sum of its proper divisors (21331).

1297409 is an equidigital number, since it uses as much as digits as its factorization.

1297409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1297409 is about 1139.0386297225. The cubic root of 1297409 is about 109.0667324159.

The spelling of 1297409 in words is "one million, two hundred ninety-seven thousand, four hundred nine".