12145807 has 4 divisors (see below), whose sum is σ = 12785080. Its totient is φ = 11506536.

The previous prime is 12145801. The next prime is 12145829. The reversal of 12145807 is 70854121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12145807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319608 + ... + 319645.

It is an arithmetic number, because the mean of its divisors is an integer number (3196270).

Almost surely, 2^12145807 is an apocalyptic number.

12145807 is a deficient number, since it is larger than the sum of its proper divisors (639273).

12145807 is an equidigital number, since it uses as much as digits as its factorization.

12145807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639272.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 12145807 is about 3485.0834997170. The cubic root of 12145807 is about 229.8663811161.

Adding to 12145807 its reverse (70854121), we get a palindrome (82999928).

It can be divided in two parts, 1214 and 5807, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 12145807 in words is "twelve million, one hundred forty-five thousand, eight hundred seven".