12045861 has 16 divisors (see below), whose sum is σ = 17899200. Its totient is φ = 8006544.

The previous prime is 12045851. The next prime is 12045881. The reversal of 12045861 is 16854021.

It is not a de Polignac number, because 12045861 - 2¹⁷ = 11914789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12045811) 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, 17455 + ... + 18131.

It is an arithmetic number, because the mean of its divisors is an integer number (1118700).

Almost surely, 2^12045861 is an apocalyptic number.

It is an amenable number.

12045861 is a deficient number, since it is larger than the sum of its proper divisors (5853339).

12045861 is an equidigital number, since it uses as much as digits as its factorization.

12045861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 12045861 is about 3470.7147678828. The cubic root of 12045861 is about 229.2341318649.

Adding to 12045861 its reverse (16854021), we get a palindrome (28899882).

The spelling of 12045861 in words is "twelve million, forty-five thousand, eight hundred sixty-one".