1297665 has 12 divisors (see below), whose sum is σ = 2249364. Its totient is φ = 692064.

The previous prime is 1297657. The next prime is 1297669. The reversal of 1297665 is 5667921.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 651249 = 804^2 + 807^2 .

It is not a de Polignac number, because 1297665 - 2³ = 1297657 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14374 + ... + 14463.

It is an arithmetic number, because the mean of its divisors is an integer number (187447).

2^1297665 is an apocalyptic number.

1297665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297665 is a deficient number, since it is larger than the sum of its proper divisors (951699).

1297665 is a wasteful number, since it uses less digits than its factorization.

1297665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28848 (or 28845 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 1297665 is about 1139.1509996484. The cubic root of 1297665 is about 109.0739054938.

It can be divided in two parts, 12976 and 65, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 1297665 in words is "one million, two hundred ninety-seven thousand, six hundred sixty-five".