12661394 has 4 divisors (see below), whose sum is σ = 18992094. Its totient is φ = 6330696.

The previous prime is 12661381. The next prime is 12661399. The reversal of 12661394 is 49316621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49316621 = 107 ⋅460903.

It can be written as a sum of positive squares in only one way, i.e., 6436369 + 6225025 = 2537^2 + 2495^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12661394.

It is not an unprimeable number, because it can be changed into a prime (12661399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3165347 + ... + 3165350.

Almost surely, 2^12661394 is an apocalyptic number.

12661394 is a deficient number, since it is larger than the sum of its proper divisors (6330700).

12661394 is an equidigital number, since it uses as much as digits as its factorization.

12661394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330699.

The product of its digits is 7776, while the sum is 32.

The square root of 12661394 is about 3558.2852611897. The cubic root of 12661394 is about 233.0740062212.

The spelling of 12661394 in words is "twelve million, six hundred sixty-one thousand, three hundred ninety-four".