12720330 has 96 divisors (see below), whose sum is σ = 38533248. Its totient is φ = 2851200.

The previous prime is 12720317. The next prime is 12720347. The reversal of 12720330 is 3302721.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38265 + ... + 38595.

It is an arithmetic number, because the mean of its divisors is an integer number (401388).

Almost surely, 2^12720330 is an apocalyptic number.

12720330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12720330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19266624).

12720330 is an abundant number, since it is smaller than the sum of its proper divisors (25812918).

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

12720330 is a wasteful number, since it uses less digits than its factorization.

12720330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 12720330 is about 3566.5571634281. The cubic root of 12720330 is about 233.4350826080.

The spelling of 12720330 in words is "twelve million, seven hundred twenty thousand, three hundred thirty".