1379799909 has 6 divisors (see below), whose sum is σ = 1993044326. Its totient is φ = 919866600.

The previous prime is 1379799887. The next prime is 1379799913. The reversal of 1379799909 is 9099979731.

It can be written as a sum of positive squares in only one way, i.e., 708730884 + 671069025 = 26622^2 + 25905^2 .

It is not a de Polignac number, because 1379799909 - 2¹³ = 1379791717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379799959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76655542 + ... + 76655559.

Almost surely, 2^1379799909 is an apocalyptic number.

It is an amenable number.

1379799909 is a deficient number, since it is larger than the sum of its proper divisors (613244417).

1379799909 is a wasteful number, since it uses less digits than its factorization.

1379799909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153311107 (or 153311104 counting only the distinct ones).

The product of its (nonzero) digits is 8680203, while the sum is 63.

The square root of 1379799909 is about 37145.6580100555. The cubic root of 1379799909 is about 1113.2824700868.

The spelling of 1379799909 in words is "one billion, three hundred seventy-nine million, seven hundred ninety-nine thousand, nine hundred nine".