12147489 has 10 divisors (see below), whose sum is σ = 18146370. Its totient is φ = 8098272.

The previous prime is 12147463. The next prime is 12147529. The reversal of 12147489 is 98474121.

12147489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6671889 + 5475600 = 2583^2 + 2340^2 .

It is not a de Polignac number, because 12147489 - 2⁷ = 12147361 is a prime.

It is a super-2 number, since 2×12147489² = 295122978010242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12147589) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74904 + ... + 75065.

It is an arithmetic number, because the mean of its divisors is an integer number (1814637).

Almost surely, 2^12147489 is an apocalyptic number.

It is an amenable number.

12147489 is a deficient number, since it is larger than the sum of its proper divisors (5998881).

12147489 is an equidigital number, since it uses as much as digits as its factorization.

12147489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149981 (or 149972 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12147489 is about 3485.3248055239. The cubic root of 12147489 is about 229.8769915653.

The spelling of 12147489 in words is "twelve million, one hundred forty-seven thousand, four hundred eighty-nine".