12045547 has 4 divisors (see below), whose sum is σ = 12325720. Its totient is φ = 11765376.

The previous prime is 12045521. The next prime is 12045589. The reversal of 12045547 is 74554021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74554021 = 1627 ⋅45823.

It is a cyclic number.

It is not a de Polignac number, because 12045547 - 2¹⁹ = 11521259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12045247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140022 + ... + 140107.

It is an arithmetic number, because the mean of its divisors is an integer number (3081430).

Almost surely, 2^12045547 is an apocalyptic number.

12045547 is a deficient number, since it is larger than the sum of its proper divisors (280173).

12045547 is an equidigital number, since it uses as much as digits as its factorization.

12045547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280172.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 12045547 is about 3470.6695319491. The cubic root of 12045547 is about 229.2321400288.

Adding to 12045547 its reverse (74554021), we get a palindrome (86599568).

The spelling of 12045547 in words is "twelve million, forty-five thousand, five hundred forty-seven".