11993905 has 16 divisors (see below), whose sum is σ = 17944704. Its totient is φ = 7476480.

The previous prime is 11993899. The next prime is 11993909. The reversal of 11993905 is 50939911.

It is not a de Polignac number, because 11993905 - 2³ = 11993897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11993909) 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 15 ways as a sum of consecutive naturals, for example, 15192 + ... + 15961.

It is an arithmetic number, because the mean of its divisors is an integer number (1121544).

Almost surely, 2^11993905 is an apocalyptic number.

It is an amenable number.

11993905 is a deficient number, since it is larger than the sum of its proper divisors (5950799).

11993905 is a wasteful number, since it uses less digits than its factorization.

11993905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31176.

The product of its (nonzero) digits is 10935, while the sum is 37.

The square root of 11993905 is about 3463.2217659284. The cubic root of 11993905 is about 228.9040806502.

The spelling of 11993905 in words is "eleven million, nine hundred ninety-three thousand, nine hundred five".