1297921 has 4 divisors (see below), whose sum is σ = 1303344. Its totient is φ = 1292500.

The previous prime is 1297873. The next prime is 1297927.

1297921 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1297921 - 2¹¹ = 1295873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297927) 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, 2335 + ... + 2836.

It is an arithmetic number, because the mean of its divisors is an integer number (325836).

2^1297921 is an apocalyptic number.

It is an amenable number.

1297921 is a deficient number, since it is larger than the sum of its proper divisors (5423).

1297921 is an equidigital number, since it uses as much as digits as its factorization.

1297921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422.

The product of its digits is 2268, while the sum is 31.

The square root of 1297921 is about 1139.2633584909. The cubic root of 1297921 is about 109.0810776283.

The spelling of 1297921 in words is "one million, two hundred ninety-seven thousand, nine hundred twenty-one".