12749780 has 12 divisors (see below), whose sum is σ = 26774580. Its totient is φ = 5099904.

The previous prime is 12749771. The next prime is 12749783. The reversal of 12749780 is 8794721.

It can be written as a sum of positive squares in 2 ways, for example, as 7376656 + 5373124 = 2716^2 + 2318^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12749783) 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 3 ways as a sum of consecutive naturals, for example, 318725 + ... + 318764.

It is an arithmetic number, because the mean of its divisors is an integer number (2231215).

Almost surely, 2^12749780 is an apocalyptic number.

12749780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12749780 is an abundant number, since it is smaller than the sum of its proper divisors (14024800).

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

12749780 is a wasteful number, since it uses less digits than its factorization.

12749780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637498 (or 637496 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 12749780 is about 3570.6834079767. The cubic root of 12749780 is about 233.6150927338.

The spelling of 12749780 in words is "twelve million, seven hundred forty-nine thousand, seven hundred eighty".