11921747 has 4 divisors (see below), whose sum is σ = 11969496. Its totient is φ = 11874000.

The previous prime is 11921729. The next prime is 11921753. The reversal of 11921747 is 74712911.

11921747 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11921747 - 2¹² = 11917651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11920747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23498 + ... + 23999.

It is an arithmetic number, because the mean of its divisors is an integer number (2992374).

Almost surely, 2^11921747 is an apocalyptic number.

11921747 is a deficient number, since it is larger than the sum of its proper divisors (47749).

11921747 is an equidigital number, since it uses as much as digits as its factorization.

11921747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47748.

The product of its digits is 3528, while the sum is 32.

The square root of 11921747 is about 3452.7882935390. The cubic root of 11921747 is about 228.4441110337. Note that the first 3 decimals are identical.

The spelling of 11921747 in words is "eleven million, nine hundred twenty-one thousand, seven hundred forty-seven".