12947440 has 40 divisors (see below), whose sum is σ = 32841648. Its totient is φ = 4707840.

The previous prime is 12947437. The next prime is 12947443. The reversal of 12947440 is 4474921.

It is an interprime number because it is at equal distance from previous prime (12947437) and next prime (12947443).

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12947443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6477 + ... + 8236.

Almost surely, 2^12947440 is an apocalyptic number.

12947440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12947440 is an abundant number, since it is smaller than the sum of its proper divisors (19894208).

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

12947440 is a wasteful number, since it uses less digits than its factorization.

12947440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14737 (or 14731 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 12947440 is about 3598.2551326997. The cubic root of 12947440 is about 234.8161531761.

The spelling of 12947440 in words is "twelve million, nine hundred forty-seven thousand, four hundred forty".