12147940 has 24 divisors (see below), whose sum is σ = 29155392. Its totient is φ = 4164960.

The previous prime is 12147917. The next prime is 12147943. The reversal of 12147940 is 4974121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 12147899 and 12147908.

It is not an unprimeable number, because it can be changed into a prime (12147943) 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 7 ways as a sum of consecutive naturals, for example, 43246 + ... + 43525.

It is an arithmetic number, because the mean of its divisors is an integer number (1214808).

Almost surely, 2^12147940 is an apocalyptic number.

12147940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12147940 is an abundant number, since it is smaller than the sum of its proper divisors (17007452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12147940 is a wasteful number, since it uses less digits than its factorization.

12147940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86787 (or 86785 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 12147940 is about 3485.3895047756. The cubic root of 12147940 is about 229.8798364123.

The spelling of 12147940 in words is "twelve million, one hundred forty-seven thousand, nine hundred forty".