12641994 has 40 divisors (see below), whose sum is σ = 28742340. Its totient is φ = 4152384.

The previous prime is 12641987. The next prime is 12642001. The reversal of 12641994 is 49914621.

It is a happy number.

12641994 is a `hidden beast` number, since 1 + 2 + 641 + 9 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (12641987) and next prime (12642001).

It can be written as a sum of positive squares in 2 ways, for example, as 12638025 + 3969 = 3555^2 + 63^2 .

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 11292 + ... + 12360.

Almost surely, 2^12641994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12641994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14371170).

12641994 is an abundant number, since it is smaller than the sum of its proper divisors (16100346).

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

12641994 is a wasteful number, since it uses less digits than its factorization.

12641994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1147 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 12641994 is about 3555.5581840268. The cubic root of 12641994 is about 232.9549054054.

The spelling of 12641994 in words is "twelve million, six hundred forty-one thousand, nine hundred ninety-four".