1306751220 has 144 divisors (see below), whose sum is σ = 4197473280. Its totient is φ = 328147200.

The previous prime is 1306751219. The next prime is 1306751261. The reversal of 1306751220 is 221576031.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 617965 + ... + 620075.

It is an arithmetic number, because the mean of its divisors is an integer number (29149120).

Almost surely, 2^1306751220 is an apocalyptic number.

1306751220 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 1306751220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2098736640).

1306751220 is an abundant number, since it is smaller than the sum of its proper divisors (2890722060).

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

1306751220 is a wasteful number, since it uses less digits than its factorization.

1306751220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326 (or 2321 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1306751220 is about 36149.0140944397. The cubic root of 1306751220 is about 1093.2789125781.

The spelling of 1306751220 in words is "one billion, three hundred six million, seven hundred fifty-one thousand, two hundred twenty".