12798721 has 8 divisors (see below), whose sum is σ = 13827240. Its totient is φ = 11776512.

The previous prime is 12798661. The next prime is 12798727. The reversal of 12798721 is 12789721.

It can be written as a sum of positive squares in 4 ways, for example, as 583696 + 12215025 = 764^2 + 3495^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12798721 - 2¹¹ = 12796673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12798727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3195 + ... + 5983.

It is an arithmetic number, because the mean of its divisors is an integer number (1728405).

Almost surely, 2^12798721 is an apocalyptic number.

It is an amenable number.

12798721 is a deficient number, since it is larger than the sum of its proper divisors (1028519).

12798721 is a wasteful number, since it uses less digits than its factorization.

12798721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155.

The product of its digits is 14112, while the sum is 37.

The square root of 12798721 is about 3577.5300138503. The cubic root of 12798721 is about 233.9136275086.

It can be divided in two parts, 1279 and 8721, that added together give a 4-th power (10000 = 10⁴).

The spelling of 12798721 in words is "twelve million, seven hundred ninety-eight thousand, seven hundred twenty-one".