12071780 has 72 divisors (see below), whose sum is σ = 30472512. Its totient is φ = 3934656.

The previous prime is 12071779. The next prime is 12071789. The reversal of 12071780 is 8717021.

It is not an unprimeable number, because it can be changed into a prime (12071789) 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 23 ways as a sum of consecutive naturals, for example, 73979 + ... + 74141.

Almost surely, 2^12071780 is an apocalyptic number.

12071780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12071780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15236256).

12071780 is an abundant number, since it is smaller than the sum of its proper divisors (18400732).

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

12071780 is a wasteful number, since it uses less digits than its factorization.

12071780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 12071780 is about 3474.4467185438. The cubic root of 12071780 is about 229.3984279416.

The spelling of 12071780 in words is "twelve million, seventy-one thousand, seven hundred eighty".