1299863 has 4 divisors (see below), whose sum is σ = 1315608. Its totient is φ = 1284120.

The previous prime is 1299853. The next prime is 1299869. The reversal of 1299863 is 3689921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3689921 = 239 ⋅15439.

It is a cyclic number.

It is not a de Polignac number, because 1299863 - 2¹⁴ = 1283479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299869) 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, 7748 + ... + 7913.

It is an arithmetic number, because the mean of its divisors is an integer number (328902).

2^1299863 is an apocalyptic number.

1299863 is a deficient number, since it is larger than the sum of its proper divisors (15745).

1299863 is an equidigital number, since it uses as much as digits as its factorization.

1299863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15744.

The product of its digits is 23328, while the sum is 38.

The square root of 1299863 is about 1140.1153450419. The cubic root of 1299863 is about 109.1354543041.

The spelling of 1299863 in words is "one million, two hundred ninety-nine thousand, eight hundred sixty-three".