2238978779 has 4 divisors (see below), whose sum is σ = 2255086680. Its totient is φ = 2222870880.

The previous prime is 2238978733. The next prime is 2238978827. The reversal of 2238978779 is 9778798322.

2238978779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2238978779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2238978179) 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, 8053742 + ... + 8054019.

It is an arithmetic number, because the mean of its divisors is an integer number (563771670).

Almost surely, 2^2238978779 is an apocalyptic number.

2238978779 is a deficient number, since it is larger than the sum of its proper divisors (16107901).

2238978779 is a wasteful number, since it uses less digits than its factorization.

2238978779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16107900.

The product of its digits is 21337344, while the sum is 62.

The square root of 2238978779 is about 47317.8484189634. The cubic root of 2238978779 is about 1308.2276556599.

The spelling of 2238978779 in words is "two billion, two hundred thirty-eight million, nine hundred seventy-eight thousand, seven hundred seventy-nine".