1298663 has 4 divisors (see below), whose sum is σ = 1333800. Its totient is φ = 1263528.

The previous prime is 1298653. The next prime is 1298699. The reversal of 1298663 is 3668921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1298663 - 2¹⁴ = 1282279 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 (1298653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17513 + ... + 17586.

It is an arithmetic number, because the mean of its divisors is an integer number (333450).

2^1298663 is an apocalyptic number.

1298663 is a deficient number, since it is larger than the sum of its proper divisors (35137).

1298663 is an equidigital number, since it uses as much as digits as its factorization.

1298663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35136.

The product of its digits is 15552, while the sum is 35.

The square root of 1298663 is about 1139.5889609855. The cubic root of 1298663 is about 109.1018602853.

The spelling of 1298663 in words is "one million, two hundred ninety-eight thousand, six hundred sixty-three".