12347780 has 48 divisors (see below), whose sum is σ = 28667520. Its totient is φ = 4443648.

The previous prime is 12347773. The next prime is 12347789. The reversal of 12347780 is 8774321.

12347780 = T₈₁ + T₈₂ + ... + T₄₂₀.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12347789) 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 15 ways as a sum of consecutive naturals, for example, 7031 + ... + 8609.

It is an arithmetic number, because the mean of its divisors is an integer number (597240).

Almost surely, 2^12347780 is an apocalyptic number.

12347780 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 12347780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14333760).

12347780 is an abundant number, since it is smaller than the sum of its proper divisors (16319740).

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

12347780 is a wasteful number, since it uses less digits than its factorization.

12347780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 12347780 is about 3513.9408076972. The cubic root of 12347780 is about 231.1335347312.

The spelling of 12347780 in words is "twelve million, three hundred forty-seven thousand, seven hundred eighty".