12709440 has 112 divisors (see below), whose sum is σ = 44866560. Its totient is φ = 3386880.

The previous prime is 12709427. The next prime is 12709447. The reversal of 12709440 is 4490721.

It is a happy number.

It is a super-2 number, since 2×12709440² = 323059730227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12709447) 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, 7905 + ... + 9375.

Almost surely, 2^12709440 is an apocalyptic number.

12709440 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 12709440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22433280).

12709440 is an abundant number, since it is smaller than the sum of its proper divisors (32157120).

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

12709440 is a wasteful number, since it uses less digits than its factorization.

12709440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 12709440 is about 3565.0301541502. The cubic root of 12709440 is about 233.3684482299.

The spelling of 12709440 in words is "twelve million, seven hundred nine thousand, four hundred forty".