12409780 has 24 divisors (see below), whose sum is σ = 26138952. Its totient is φ = 4948992.

The previous prime is 12409729. The next prime is 12409801. The reversal of 12409780 is 8790421.

It can be written as a sum of positive squares in 4 ways, for example, as 944784 + 11464996 = 972^2 + 3386^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7944 + ... + 9376.

It is an arithmetic number, because the mean of its divisors is an integer number (1089123).

Almost surely, 2^12409780 is an apocalyptic number.

12409780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12409780 is an abundant number, since it is smaller than the sum of its proper divisors (13729172).

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

12409780 is a wasteful number, since it uses less digits than its factorization.

12409780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 12409780 is about 3522.7517653107. The cubic root of 12409780 is about 231.5197407545.

The spelling of 12409780 in words is "twelve million, four hundred nine thousand, seven hundred eighty".