12661974 has 64 divisors (see below), whose sum is σ = 32114880. Its totient is φ = 3663360.

The previous prime is 12661973. The next prime is 12661997. The reversal of 12661974 is 47916621.

12661974 = T₁₂₁₂ + T₁₂₁₃ + ... + T₁₂₂₈.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11404 + ... + 12464.

It is an arithmetic number, because the mean of its divisors is an integer number (501795).

Almost surely, 2^12661974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12661974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16057440).

12661974 is an abundant number, since it is smaller than the sum of its proper divisors (19452906).

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

12661974 is a wasteful number, since it uses less digits than its factorization.

12661974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1096 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 12661974 is about 3558.3667601865. The cubic root of 12661974 is about 233.0775650937.

It can be divided in two parts, 1266 and 1974, that added together give a triangular number (3240 = T₈₀).

The spelling of 12661974 in words is "twelve million, six hundred sixty-one thousand, nine hundred seventy-four".