12721654 has 16 divisors (see below), whose sum is σ = 20892096. Its totient is φ = 5761800.

The previous prime is 12721651. The next prime is 12721663. The reversal of 12721654 is 45612721.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6409 + ... + 8155.

It is an arithmetic number, because the mean of its divisors is an integer number (1305756).

Almost surely, 2^12721654 is an apocalyptic number.

12721654 is a deficient number, since it is larger than the sum of its proper divisors (8170442).

12721654 is a wasteful number, since it uses less digits than its factorization.

12721654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091.

The product of its digits is 3360, while the sum is 28.

The square root of 12721654 is about 3566.7427717737. The cubic root of 12721654 is about 233.4431813845.

It can be divided in two parts, 1272 and 1654, that added together give a triangular number (2926 = T₇₆).

The spelling of 12721654 in words is "twelve million, seven hundred twenty-one thousand, six hundred fifty-four".