12720140 has 24 divisors (see below), whose sum is σ = 26889072. Its totient is φ = 5054400.

The previous prime is 12720133. The next prime is 12720157. The reversal of 12720140 is 4102721.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1115 + ... + 5165.

It is an arithmetic number, because the mean of its divisors is an integer number (1120378).

Almost surely, 2^12720140 is an apocalyptic number.

12720140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12720140 is an abundant number, since it is smaller than the sum of its proper divisors (14168932).

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

12720140 is a wasteful number, since it uses less digits than its factorization.

12720140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4217 (or 4215 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 12720140 is about 3566.5305269968. The cubic root of 12720140 is about 233.4339203508.

Adding to 12720140 its reverse (4102721), we get a palindrome (16822861).

The spelling of 12720140 in words is "twelve million, seven hundred twenty thousand, one hundred forty".