11998399 has 4 divisors (see below), whose sum is σ = 13712464. Its totient is φ = 10284336.

The previous prime is 11998391. The next prime is 11998439. The reversal of 11998399 is 99389911.

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 11998399 - 2³ = 11998391 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 (11998391) 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, 857022 + ... + 857035.

It is an arithmetic number, because the mean of its divisors is an integer number (3428116).

Almost surely, 2^11998399 is an apocalyptic number.

11998399 is a deficient number, since it is larger than the sum of its proper divisors (1714065).

11998399 is an equidigital number, since it uses as much as digits as its factorization.

11998399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714064.

The product of its digits is 157464, while the sum is 49.

The square root of 11998399 is about 3463.8705229844. The cubic root of 11998399 is about 228.9326664606.

The spelling of 11998399 in words is "eleven million, nine hundred ninety-eight thousand, three hundred ninety-nine".