1306399 has 4 divisors (see below), whose sum is σ = 1383264. Its totient is φ = 1229536.

The previous prime is 1306391. The next prime is 1306411. The reversal of 1306399 is 9936031.

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 1306399 - 2³ = 1306391 is a prime.

It is a Duffinian number.

1306399 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1306399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306391) 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, 38407 + ... + 38440.

It is an arithmetic number, because the mean of its divisors is an integer number (345816).

2^1306399 is an apocalyptic number.

1306399 is a deficient number, since it is larger than the sum of its proper divisors (76865).

1306399 is an equidigital number, since it uses as much as digits as its factorization.

1306399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76864.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 1306399 is about 1142.9781275248. The cubic root of 1306399 is about 109.3180676766.

The spelling of 1306399 in words is "one million, three hundred six thousand, three hundred ninety-nine".