1297643 has 8 divisors (see below), whose sum is σ = 1377600. Its totient is φ = 1218888.

The previous prime is 1297633. The next prime is 1297649. The reversal of 1297643 is 3467921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1297643 - 2¹⁸ = 1035499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297649) 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 7 ways as a sum of consecutive naturals, for example, 2888 + ... + 3306.

It is an arithmetic number, because the mean of its divisors is an integer number (172200).

2^1297643 is an apocalyptic number.

1297643 is a deficient number, since it is larger than the sum of its proper divisors (79957).

1297643 is a wasteful number, since it uses less digits than its factorization.

1297643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its digits is 9072, while the sum is 32.

The square root of 1297643 is about 1139.1413432933. The cubic root of 1297643 is about 109.0732890945.

The spelling of 1297643 in words is "one million, two hundred ninety-seven thousand, six hundred forty-three".