12145720 has 16 divisors (see below), whose sum is σ = 27327960. Its totient is φ = 4858272.

The previous prime is 12145711. The next prime is 12145723. The reversal of 12145720 is 2754121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12145691 and 12145700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12145723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151782 + ... + 151861.

Almost surely, 2^12145720 is an apocalyptic number.

12145720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12145720 is an abundant number, since it is smaller than the sum of its proper divisors (15182240).

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

12145720 is a wasteful number, since it uses less digits than its factorization.

12145720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303654 (or 303650 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12145720 is about 3485.0710179278. The cubic root of 12145720 is about 229.8658322731.

Adding to 12145720 its reverse (2754121), we get a palindrome (14899841).

The spelling of 12145720 in words is "twelve million, one hundred forty-five thousand, seven hundred twenty".