1243399 has 4 divisors (see below), whose sum is σ = 1245664. Its totient is φ = 1241136.

The previous prime is 1243393. The next prime is 1243421. The reversal of 1243399 is 9933421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9933421 = 491 ⋅20231.

It is a cyclic number.

It is not a de Polignac number, because 1243399 - 2³ = 1243391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (311416).

2^1243399 is an apocalyptic number.

1243399 is a deficient number, since it is larger than the sum of its proper divisors (2265).

1243399 is an equidigital number, since it uses as much as digits as its factorization.

1243399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its digits is 5832, while the sum is 31.

The square root of 1243399 is about 1115.0780241759. The cubic root of 1243399 is about 107.5317807604.

The spelling of 1243399 in words is "one million, two hundred forty-three thousand, three hundred ninety-nine".