12661904 has 20 divisors (see below), whose sum is σ = 25824240. Its totient is φ = 5997600.

The previous prime is 12661903. The next prime is 12661949. The reversal of 12661904 is 40916621.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12661903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20522 + ... + 21129.

It is an arithmetic number, because the mean of its divisors is an integer number (1291212).

Almost surely, 2^12661904 is an apocalyptic number.

It is an amenable number.

12661904 is an abundant number, since it is smaller than the sum of its proper divisors (13162336).

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

12661904 is a wasteful number, since it uses less digits than its factorization.

12661904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41678 (or 41672 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 12661904 is about 3558.3569241997. The cubic root of 12661904 is about 233.0771355803.

The spelling of 12661904 in words is "twelve million, six hundred sixty-one thousand, nine hundred four".