12704240 has 20 divisors (see below), whose sum is σ = 29537544. Its totient is φ = 5081664.

The previous prime is 12704239. The next prime is 12704261. The reversal of 12704240 is 4240721.

12704240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×12704240² = 322795427955200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79322 + ... + 79481.

Almost surely, 2^12704240 is an apocalyptic number.

12704240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12704240 is an abundant number, since it is smaller than the sum of its proper divisors (16833304).

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

12704240 is a wasteful number, since it uses less digits than its factorization.

12704240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158816 (or 158810 counting only the distinct ones).

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

The square root of 12704240 is about 3564.3007729427. The cubic root of 12704240 is about 233.3366167338.

Adding to 12704240 its reverse (4240721), we get a palindrome (16944961).

The spelling of 12704240 in words is "twelve million, seven hundred four thousand, two hundred forty".