1380979505 has 4 divisors (see below), whose sum is σ = 1657175412. Its totient is φ = 1104783600.

The previous prime is 1380979499. The next prime is 1380979543. The reversal of 1380979505 is 5059790831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389233441 + 991746064 = 19729^2 + 31492^2 .

It is not a de Polignac number, because 1380979505 - 2¹⁶ = 1380913969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1380979505.

It is an unprimeable number.

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, 138097946 + ... + 138097955.

It is an arithmetic number, because the mean of its divisors is an integer number (414293853).

Almost surely, 2^1380979505 is an apocalyptic number.

It is an amenable number.

1380979505 is a deficient number, since it is larger than the sum of its proper divisors (276195907).

1380979505 is an equidigital number, since it uses as much as digits as its factorization.

1380979505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276195906.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 1380979505 is about 37161.5325975665. The cubic root of 1380979505 is about 1113.5996294786.

The spelling of 1380979505 in words is "one billion, three hundred eighty million, nine hundred seventy-nine thousand, five hundred five".