11978599 has 4 divisors (see below), whose sum is σ = 12113280. Its totient is φ = 11843920.

The previous prime is 11978587. The next prime is 11978609. The reversal of 11978599 is 99587911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99587911 = 19 ⋅5241469.

It is a cyclic number.

It is not a de Polignac number, because 11978599 - 2⁵ = 11978567 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 (11978539) 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, 67207 + ... + 67384.

It is an arithmetic number, because the mean of its divisors is an integer number (3028320).

Almost surely, 2^11978599 is an apocalyptic number.

11978599 is a deficient number, since it is larger than the sum of its proper divisors (134681).

11978599 is an equidigital number, since it uses as much as digits as its factorization.

11978599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134680.

The product of its digits is 204120, while the sum is 49.

The square root of 11978599 is about 3461.0112684012. The cubic root of 11978599 is about 228.8066673587.

The spelling of 11978599 in words is "eleven million, nine hundred seventy-eight thousand, five hundred ninety-nine".