1378739779 has 4 divisors (see below), whose sum is σ = 1426282560. Its totient is φ = 1331197000.

The previous prime is 1378739773. The next prime is 1378739819. The reversal of 1378739779 is 9779378731.

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

It is a cyclic number.

It is not a de Polignac number, because 1378739779 - 2³ = 1378739771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378739771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23771347 + ... + 23771404.

It is an arithmetic number, because the mean of its divisors is an integer number (356570640).

Almost surely, 2^1378739779 is an apocalyptic number.

1378739779 is a deficient number, since it is larger than the sum of its proper divisors (47542781).

1378739779 is an equidigital number, since it uses as much as digits as its factorization.

1378739779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47542780.

The product of its digits is 14002632, while the sum is 61.

The square root of 1378739779 is about 37131.3853633284. The cubic root of 1378739779 is about 1112.9972773980.

The spelling of 1378739779 in words is "one billion, three hundred seventy-eight million, seven hundred thirty-nine thousand, seven hundred seventy-nine".