2779281938 has 4 divisors (see below), whose sum is σ = 4168922910. Its totient is φ = 1389640968.

The previous prime is 2779281931. The next prime is 2779281949. The reversal of 2779281938 is 8391829772.

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

It can be written as a sum of positive squares in only one way, i.e., 2767496449 + 11785489 = 52607^2 + 3433^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2779281931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694820483 + ... + 694820486.

Almost surely, 2^2779281938 is an apocalyptic number.

2779281938 is a deficient number, since it is larger than the sum of its proper divisors (1389640972).

2779281938 is a wasteful number, since it uses less digits than its factorization.

2779281938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389640971.

The product of its digits is 3048192, while the sum is 56.

The square root of 2779281938 is about 52718.8954550453. The cubic root of 2779281938 is about 1405.9747946247.

The spelling of 2779281938 in words is "two billion, seven hundred seventy-nine million, two hundred eighty-one thousand, nine hundred thirty-eight".