1309683780 has 36 divisors (see below), whose sum is σ = 3972708012. Its totient is φ = 349248960.

The previous prime is 1309683769. The next prime is 1309683839. The reversal of 1309683780 is 873869031.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1002102336 + 307581444 = 31656^2 + 17538^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3637831 + ... + 3638190.

Almost surely, 2^1309683780 is an apocalyptic number.

1309683780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309683780 is an abundant number, since it is smaller than the sum of its proper divisors (2663024232).

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

1309683780 is a wasteful number, since it uses less digits than its factorization.

1309683780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276036 (or 7276031 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1309683780 is about 36189.5534650540. The cubic root of 1309683780 is about 1094.0961328226.

The spelling of 1309683780 in words is "one billion, three hundred nine million, six hundred eighty-three thousand, seven hundred eighty".