12940161 has 12 divisors (see below), whose sum is σ = 18683568. Its totient is φ = 7962864.

The previous prime is 12940139. The next prime is 12940163. The reversal of 12940161 is 16104921.

It is not a de Polignac number, because 12940161 - 2⁵ = 12940129 is a prime.

It is a hoax number, since the sum of its digits (24) 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 (12940163) 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 11 ways as a sum of consecutive naturals, for example, 12255 + ... + 13268.

It is an arithmetic number, because the mean of its divisors is an integer number (1556964).

Almost surely, 2^12940161 is an apocalyptic number.

It is an amenable number.

12940161 is a deficient number, since it is larger than the sum of its proper divisors (5743407).

12940161 is a wasteful number, since it uses less digits than its factorization.

12940161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25552 (or 25539 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 12940161 is about 3597.2435280364. The cubic root of 12940161 is about 234.7721406870.

The spelling of 12940161 in words is "twelve million, nine hundred forty thousand, one hundred sixty-one".