2779381389 has 16 divisors (see below), whose sum is σ = 3937351680. Its totient is φ = 1738989360.

The previous prime is 2779381379. The next prime is 2779381457. The reversal of 2779381389 is 9831839772.

It is not a de Polignac number, because 2779381389 - 2⁷ = 2779381261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2779381379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221757 + ... + 233954.

It is an arithmetic number, because the mean of its divisors is an integer number (246084480).

Almost surely, 2^2779381389 is an apocalyptic number.

It is an amenable number.

2779381389 is a deficient number, since it is larger than the sum of its proper divisors (1157970291).

2779381389 is a wasteful number, since it uses less digits than its factorization.

2779381389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455840.

The product of its digits is 4572288, while the sum is 57.

The square root of 2779381389 is about 52719.8386662934. The cubic root of 2779381389 is about 1405.9915644157.

The spelling of 2779381389 in words is "two billion, seven hundred seventy-nine million, three hundred eighty-one thousand, three hundred eighty-nine".