12012780 has 48 divisors (see below), whose sum is σ = 36225504. Its totient is φ = 2956800.

The previous prime is 12012743. The next prime is 12012809. The reversal of 12012780 is 8721021.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6921 + ... + 8480.

It is an arithmetic number, because the mean of its divisors is an integer number (754698).

Almost surely, 2^12012780 is an apocalyptic number.

12012780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012780 is an abundant number, since it is smaller than the sum of its proper divisors (24212724).

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

12012780 is a wasteful number, since it uses less digits than its factorization.

12012780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15426 (or 15424 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 12012780 is about 3465.9457583753. The cubic root of 12012780 is about 229.0240943864.

The spelling of 12012780 in words is "twelve million, twelve thousand, seven hundred eighty".