11921787 has 12 divisors (see below), whose sum is σ = 17263584. Its totient is φ = 7927920.

The previous prime is 11921773. The next prime is 11921827. The reversal of 11921787 is 78712911.

11921787 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11921787 - 2¹⁴ = 11905403 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (11921087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2737 + ... + 5597.

It is an arithmetic number, because the mean of its divisors is an integer number (1438632).

Almost surely, 2^11921787 is an apocalyptic number.

11921787 is a deficient number, since it is larger than the sum of its proper divisors (5341797).

11921787 is a wasteful number, since it uses less digits than its factorization.

11921787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330 (or 3327 counting only the distinct ones).

The product of its digits is 7056, while the sum is 36.

The square root of 11921787 is about 3452.7940859542. The cubic root of 11921787 is about 228.4443665263. Note that the first 3 decimals are identical.

The spelling of 11921787 in words is "eleven million, nine hundred twenty-one thousand, seven hundred eighty-seven".