1297645 has 8 divisors (see below), whose sum is σ = 1572120. Its totient is φ = 1028160.

The previous prime is 1297633. The next prime is 1297649. The reversal of 1297645 is 5467921.

It can be written as a sum of positive squares in 4 ways, for example, as 2601 + 1295044 = 51^2 + 1138^2 .

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

It is not a de Polignac number, because 1297645 - 2¹⁵ = 1264877 is a prime.

It is a super-3 number, since 3×1297645³ = 6555245299309833375, which contains 333 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1297645.

It is a congruent 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, 646 + ... + 1735.

It is an arithmetic number, because the mean of its divisors is an integer number (196515).

2^1297645 is an apocalyptic number.

It is an amenable number.

1297645 is a deficient number, since it is larger than the sum of its proper divisors (274475).

1297645 is a wasteful number, since it uses less digits than its factorization.

1297645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495.

The product of its digits is 15120, while the sum is 34.

The square root of 1297645 is about 1139.1422211471. The cubic root of 1297645 is about 109.0733451311.

The spelling of 1297645 in words is "one million, two hundred ninety-seven thousand, six hundred forty-five".