11907921 has 4 divisors (see below), whose sum is σ = 15877232. Its totient is φ = 7938612.

The previous prime is 11907919. The next prime is 11907941. The reversal of 11907921 is 12970911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11907921 - 2¹ = 11907919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11907941) 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 3 ways as a sum of consecutive naturals, for example, 1984651 + ... + 1984656.

It is an arithmetic number, because the mean of its divisors is an integer number (3969308).

Almost surely, 2^11907921 is an apocalyptic number.

It is an amenable number.

11907921 is a deficient number, since it is larger than the sum of its proper divisors (3969311).

11907921 is an equidigital number, since it uses as much as digits as its factorization.

11907921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969310.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 11907921 is about 3450.7855627379. The cubic root of 11907921 is about 228.3557657586.

The spelling of 11907921 in words is "eleven million, nine hundred seven thousand, nine hundred twenty-one".