11918905 has 16 divisors (see below), whose sum is σ = 14941584. Its totient is φ = 9118720.

The previous prime is 11918903. The next prime is 11918927. The reversal of 11918905 is 50981911.

It can be written as a sum of positive squares in 8 ways, for example, as 1401856 + 10517049 = 1184^2 + 3243^2 .

It is not a de Polignac number, because 11918905 - 2¹ = 11918903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11918903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10317 + ... + 11413.

It is an arithmetic number, because the mean of its divisors is an integer number (933849).

Almost surely, 2^11918905 is an apocalyptic number.

It is an amenable number.

11918905 is a deficient number, since it is larger than the sum of its proper divisors (3022679).

11918905 is a wasteful number, since it uses less digits than its factorization.

11918905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 11918905 is about 3452.3767175672. The cubic root of 11918905 is about 228.4259568219.

The spelling of 11918905 in words is "eleven million, nine hundred eighteen thousand, nine hundred five".