12720540 has 96 divisors (see below), whose sum is σ = 42061824. Its totient is φ = 2810880.

The previous prime is 12720529. The next prime is 12720559. The reversal of 12720540 is 4502721.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12532 + ... + 13508.

It is an arithmetic number, because the mean of its divisors is an integer number (438144).

Almost surely, 2^12720540 is an apocalyptic number.

12720540 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 12720540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21030912).

12720540 is an abundant number, since it is smaller than the sum of its proper divisors (29341284).

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

12720540 is a wasteful number, since it uses less digits than its factorization.

12720540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 12720540 is about 3566.5866034628. The cubic root of 12720540 is about 233.4363671947.

The spelling of 12720540 in words is "twelve million, seven hundred twenty thousand, five hundred forty".