12811240 has 64 divisors (see below), whose sum is σ = 31570560. Its totient is φ = 4650240.

The previous prime is 12811237. The next prime is 12811241. The reversal of 12811240 is 4211821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12811241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36747 + ... + 37093.

It is an arithmetic number, because the mean of its divisors is an integer number (493290).

Almost surely, 2^12811240 is an apocalyptic number.

12811240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12811240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15785280).

12811240 is an abundant number, since it is smaller than the sum of its proper divisors (18759320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12811240 is a wasteful number, since it uses less digits than its factorization.

12811240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 12811240 is about 3579.2792570572. The cubic root of 12811240 is about 233.9898697735.

The spelling of 12811240 in words is "twelve million, eight hundred eleven thousand, two hundred forty".