11920909 has 16 divisors (see below), whose sum is σ = 16007040. Its totient is φ = 8573760.

The previous prime is 11920903. The next prime is 11920913. The reversal of 11920909 is 90902911.

It is not a de Polignac number, because 11920909 - 2³ = 11920901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11920901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4954 + ... + 6955.

It is an arithmetic number, because the mean of its divisors is an integer number (1000440).

Almost surely, 2^11920909 is an apocalyptic number.

It is an amenable number.

11920909 is a deficient number, since it is larger than the sum of its proper divisors (4086131).

11920909 is a wasteful number, since it uses less digits than its factorization.

11920909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11940.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 11920909 is about 3452.6669402072. Note that the first 3 decimals coincide. The cubic root of 11920909 is about 228.4387583325.

The spelling of 11920909 in words is "eleven million, nine hundred twenty thousand, nine hundred nine".