12205780 has 12 divisors (see below), whose sum is σ = 25632180. Its totient is φ = 4882304.

The previous prime is 12205777. The next prime is 12205789. The reversal of 12205780 is 8750221.

It can be written as a sum of positive squares in 2 ways, for example, as 1669264 + 10536516 = 1292^2 + 3246^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12205789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305125 + ... + 305164.

It is an arithmetic number, because the mean of its divisors is an integer number (2136015).

Almost surely, 2^12205780 is an apocalyptic number.

12205780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12205780 is an abundant number, since it is smaller than the sum of its proper divisors (13426400).

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

12205780 is a wasteful number, since it uses less digits than its factorization.

12205780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610298 (or 610296 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 12205780 is about 3493.6771459309. The cubic root of 12205780 is about 230.2441012697.

The spelling of 12205780 in words is "twelve million, two hundred five thousand, seven hundred eighty".