12740240 has 40 divisors (see below), whose sum is σ = 30051648. Its totient is φ = 5022080.

The previous prime is 12740209. The next prime is 12740249. The reversal of 12740240 is 4204721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (12740249) 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, 4559 + ... + 6801.

Almost surely, 2^12740240 is an apocalyptic number.

12740240 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 12740240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15025824).

12740240 is an abundant number, since it is smaller than the sum of its proper divisors (17311408).

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

12740240 is a wasteful number, since it uses less digits than its factorization.

12740240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327 (or 2321 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 12740240 is about 3569.3472792655. The cubic root of 12740240 is about 233.5568108370.

Adding to 12740240 its reverse (4204721), we get a palindrome (16944961).

The spelling of 12740240 in words is "twelve million, seven hundred forty thousand, two hundred forty".