1297021 has 4 divisors (see below), whose sum is σ = 1414944. Its totient is φ = 1179100.

The previous prime is 1297019. The next prime is 1297027. The reversal of 1297021 is 1207921.

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 1297021 - 2¹ = 1297019 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1296983 and 1297001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58945 + ... + 58966.

It is an arithmetic number, because the mean of its divisors is an integer number (353736).

2^1297021 is an apocalyptic number.

1297021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1297021 is a deficient number, since it is larger than the sum of its proper divisors (117923).

1297021 is a wasteful number, since it uses less digits than its factorization.

1297021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117922.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 1297021 is about 1138.8682979168. The cubic root of 1297021 is about 109.0558589208.

The spelling of 1297021 in words is "one million, two hundred ninety-seven thousand, twenty-one".