12147478 has 8 divisors (see below), whose sum is σ = 20824272. Its totient is φ = 5206056.

The previous prime is 12147463. The next prime is 12147529. The reversal of 12147478 is 87474121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12147478² = 295122443520968, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433825 + ... + 433852.

It is an arithmetic number, because the mean of its divisors is an integer number (2603034).

Almost surely, 2^12147478 is an apocalyptic number.

12147478 is a deficient number, since it is larger than the sum of its proper divisors (8676794).

12147478 is an equidigital number, since it uses as much as digits as its factorization.

12147478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867686.

The product of its digits is 12544, while the sum is 34.

The square root of 12147478 is about 3485.3232274783. The cubic root of 12147478 is about 229.8769221780.

The spelling of 12147478 in words is "twelve million, one hundred forty-seven thousand, four hundred seventy-eight".