1380091909 has 12 divisors (see below), whose sum is σ = 1699850124. Its totient is φ = 1113350784.

The previous prime is 1380091907. The next prime is 1380091913. The reversal of 1380091909 is 9091900831.

It can be written as a sum of positive squares in 2 ways, for example, as 461820100 + 918271809 = 21490^2 + 30303^2 .

It is not a de Polignac number, because 1380091909 - 2¹ = 1380091907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380091901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 827554 + ... + 829219.

It is an arithmetic number, because the mean of its divisors is an integer number (141654177).

Almost surely, 2^1380091909 is an apocalyptic number.

It is an amenable number.

1380091909 is a deficient number, since it is larger than the sum of its proper divisors (319758215).

1380091909 is a wasteful number, since it uses less digits than its factorization.

1380091909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656804 (or 1656797 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 1380091909 is about 37149.5882749728. The cubic root of 1380091909 is about 1113.3609973066.

The spelling of 1380091909 in words is "one billion, three hundred eighty million, ninety-one thousand, nine hundred nine".