12147418 has 16 divisors (see below), whose sum is σ = 19612584. Its totient is φ = 5621760.

The previous prime is 12147397. The next prime is 12147463. The reversal of 12147418 is 81474121.

It can be written as a sum of positive squares in 4 ways, for example, as 11269449 + 877969 = 3357^2 + 937^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855 + ... + 5002.

Almost surely, 2^12147418 is an apocalyptic number.

12147418 is a deficient number, since it is larger than the sum of its proper divisors (7465166).

12147418 is a wasteful number, since it uses less digits than its factorization.

12147418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5937.

The product of its digits is 1792, while the sum is 28.

The square root of 12147418 is about 3485.3146199447. The cubic root of 12147418 is about 229.8765437005.

It can be divided in two parts, 121 and 47418, that multiplied together give a triangular number (5737578 = T₃₃₈₇).

The spelling of 12147418 in words is "twelve million, one hundred forty-seven thousand, four hundred eighteen".