12609621 has 16 divisors (see below), whose sum is σ = 19117120. Its totient is φ = 8210160.

The previous prime is 12609613. The next prime is 12609643. The reversal of 12609621 is 12690621.

12609621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12609621 - 2³ = 12609613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12601621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4270 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (1194820).

Almost surely, 2^12609621 is an apocalyptic number.

It is an amenable number.

12609621 is a deficient number, since it is larger than the sum of its proper divisors (6507499).

12609621 is a wasteful number, since it uses less digits than its factorization.

12609621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10913 (or 10907 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12609621 is about 3551.0028161070. The cubic root of 12609621 is about 232.7558889215.

The spelling of 12609621 in words is "twelve million, six hundred nine thousand, six hundred twenty-one".