11978205 has 16 divisors (see below), whose sum is σ = 19429440. Its totient is φ = 6300288.

The previous prime is 11978177. The next prime is 11978231. The reversal of 11978205 is 50287911.

It is not a de Polignac number, because 11978205 - 2⁵ = 11978173 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4375 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (1214340).

Almost surely, 2^11978205 is an apocalyptic number.

11978205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11978205 is a deficient number, since it is larger than the sum of its proper divisors (7451235).

11978205 is a wasteful number, since it uses less digits than its factorization.

11978205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 11978205 is about 3460.9543481531. The cubic root of 11978205 is about 228.8041586954.

The spelling of 11978205 in words is "eleven million, nine hundred seventy-eight thousand, two hundred five".