12240991 has 8 divisors (see below), whose sum is σ = 14598144. Its totient is φ = 10035960.

The previous prime is 12240983. The next prime is 12241013. The reversal of 12240991 is 19904221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12240991 - 2³ = 12240983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12240911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37855 + ... + 38176.

It is an arithmetic number, because the mean of its divisors is an integer number (1824768).

Almost surely, 2^12240991 is an apocalyptic number.

12240991 is a deficient number, since it is larger than the sum of its proper divisors (2357153).

12240991 is an equidigital number, since it uses as much as digits as its factorization.

12240991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76061.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 12240991 is about 3498.7127632888. The cubic root of 12240991 is about 230.4652899678.

It can be divided in two parts, 122409 and 91, that added together give a square (122500 = 350²).

The spelling of 12240991 in words is "twelve million, two hundred forty thousand, nine hundred ninety-one".