12661404 has 72 divisors (see below), whose sum is σ = 35029008. Its totient is φ = 3548160.

The previous prime is 12661399. The next prime is 12661433. The reversal of 12661404 is 40416621.

It is a super-2 number, since 2×12661404² = 320622302502432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35692 + ... + 36044.

It is an arithmetic number, because the mean of its divisors is an integer number (486514).

Almost surely, 2^12661404 is an apocalyptic number.

12661404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12661404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17514504).

12661404 is an abundant number, since it is smaller than the sum of its proper divisors (22367604).

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

12661404 is a wasteful number, since it uses less digits than its factorization.

12661404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 12661404 is about 3558.2866663607. The cubic root of 12661404 is about 233.0740675820.

The spelling of 12661404 in words is "twelve million, six hundred sixty-one thousand, four hundred four".