12147681 has 16 divisors (see below), whose sum is σ = 19935104. Its totient is φ = 6407424.

The previous prime is 12147679. The next prime is 12147689. The reversal of 12147681 is 18674121.

It is not a de Polignac number, because 12147681 - 2¹ = 12147679 is a prime.

It is a super-2 number, since 2×12147681² = 295132307355522, which contains 22 as substring.

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (12147689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21976 + ... + 22521.

It is an arithmetic number, because the mean of its divisors is an integer number (1245944).

Almost surely, 2^12147681 is an apocalyptic number.

It is an amenable number.

12147681 is a deficient number, since it is larger than the sum of its proper divisors (7787423).

12147681 is a wasteful number, since it uses less digits than its factorization.

12147681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44520.

The product of its digits is 2688, while the sum is 30.

The square root of 12147681 is about 3485.3523494763. The cubic root of 12147681 is about 229.8782026839.

The spelling of 12147681 in words is "twelve million, one hundred forty-seven thousand, six hundred eighty-one".