12955478 has 4 divisors (see below), whose sum is σ = 19433220. Its totient is φ = 6477738.

The previous prime is 12955477. The next prime is 12955487. The reversal of 12955478 is 87455921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87455921 = 7 ⋅12493703.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12955471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3238868 + ... + 3238871.

It is an arithmetic number, because the mean of its divisors is an integer number (4858305).

Almost surely, 2^12955478 is an apocalyptic number.

12955478 is a deficient number, since it is larger than the sum of its proper divisors (6477742).

12955478 is an equidigital number, since it uses as much as digits as its factorization.

12955478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477741.

The product of its digits is 100800, while the sum is 41.

The square root of 12955478 is about 3599.3718896496. The cubic root of 12955478 is about 234.8647357991.

The spelling of 12955478 in words is "twelve million, nine hundred fifty-five thousand, four hundred seventy-eight".