11821239 has 12 divisors (see below), whose sum is σ = 18079776. Its totient is φ = 7417152.

The previous prime is 11821237. The next prime is 11821267. The reversal of 11821239 is 93212811.

11821239 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11821239 - 2¹ = 11821237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821231) 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, 38479 + ... + 38784.

It is an arithmetic number, because the mean of its divisors is an integer number (1506648).

Almost surely, 2^11821239 is an apocalyptic number.

11821239 is a deficient number, since it is larger than the sum of its proper divisors (6258537).

11821239 is a wasteful number, since it uses less digits than its factorization.

11821239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77286 (or 77283 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 11821239 is about 3438.2028735954. The cubic root of 11821239 is about 227.8003214826.

The spelling of 11821239 in words is "eleven million, eight hundred twenty-one thousand, two hundred thirty-nine".