1305998 has 4 divisors (see below), whose sum is σ = 1959000. Its totient is φ = 652998.

The previous prime is 1305971. The next prime is 1306001. The reversal of 1305998 is 8995031.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 326498 + ... + 326501.

It is an arithmetic number, because the mean of its divisors is an integer number (489750).

2^1305998 is an apocalyptic number.

1305998 is a deficient number, since it is larger than the sum of its proper divisors (653002).

1305998 is an equidigital number, since it uses as much as digits as its factorization.

1305998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653001.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1305998 is about 1142.8026951316. The cubic root of 1305998 is about 109.3068814486.

The spelling of 1305998 in words is "one million, three hundred five thousand, nine hundred ninety-eight".