1299965 has 4 divisors (see below), whose sum is σ = 1559964. Its totient is φ = 1039968.

The previous prime is 1299953. The next prime is 1299979. The reversal of 1299965 is 5699921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5699921 = 29 ⋅196549.

It can be written as a sum of positive squares in 2 ways, for example, as 195364 + 1104601 = 442^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299965 - 2⁸ = 1299709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129992 + ... + 130001.

It is an arithmetic number, because the mean of its divisors is an integer number (389991).

2^1299965 is an apocalyptic number.

It is an amenable number.

1299965 is a deficient number, since it is larger than the sum of its proper divisors (259999).

1299965 is an equidigital number, since it uses as much as digits as its factorization.

1299965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259998.

The product of its digits is 43740, while the sum is 41.

The square root of 1299965 is about 1140.1600764805. The cubic root of 1299965 is about 109.1383088422.

The spelling of 1299965 in words is "one million, two hundred ninety-nine thousand, nine hundred sixty-five".