12145870 has 32 divisors (see below), whose sum is σ = 24092640. Its totient is φ = 4371840.

The previous prime is 12145853. The next prime is 12145873. The reversal of 12145870 is 7854121.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145873) 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 15 ways as a sum of consecutive naturals, for example, 11484 + ... + 12496.

It is an arithmetic number, because the mean of its divisors is an integer number (752895).

Almost surely, 2^12145870 is an apocalyptic number.

12145870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12145870 is a deficient number, since it is larger than the sum of its proper divisors (11946770).

12145870 is a wasteful number, since it uses less digits than its factorization.

12145870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140.

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

The square root of 12145870 is about 3485.0925382262. The cubic root of 12145870 is about 229.8667785525.

Adding to 12145870 its reverse (7854121), we get a palindrome (19999991).

The spelling of 12145870 in words is "twelve million, one hundred forty-five thousand, eight hundred seventy".