12721698 has 80 divisors (see below), whose sum is σ = 31885920. Its totient is φ = 3789720.

The previous prime is 12721693. The next prime is 12721703. The reversal of 12721698 is 89612721.

It is an interprime number because it is at equal distance from previous prime (12721693) and next prime (12721703).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12721693) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 215593 + ... + 215651.

It is an arithmetic number, because the mean of its divisors is an integer number (398574).

Almost surely, 2^12721698 is an apocalyptic number.

12721698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12721698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15942960).

12721698 is an abundant number, since it is smaller than the sum of its proper divisors (19164222).

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

12721698 is an equidigital number, since it uses as much as digits as its factorization.

12721698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106 (or 75 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 12721698 is about 3566.7489398611. The cubic root of 12721698 is about 233.4434505185.

The spelling of 12721698 in words is "twelve million, seven hundred twenty-one thousand, six hundred ninety-eight".