2778238 has 8 divisors (see below), whose sum is σ = 4179240. Its totient is φ = 1385160.

The previous prime is 2778233. The next prime is 2778241. The reversal of 2778238 is 8328772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2778197 and 2778206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778233) 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, 1008 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (522405).

2^2778238 is an apocalyptic number.

2778238 is a deficient number, since it is larger than the sum of its proper divisors (1401002).

2778238 is a wasteful number, since it uses less digits than its factorization.

2778238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962.

The product of its digits is 37632, while the sum is 37.

The square root of 2778238 is about 1666.8047276151. The cubic root of 2778238 is about 140.5798737840.

It can be divided in two parts, 277 and 8238, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 2778238 in words is "two million, seven hundred seventy-eight thousand, two hundred thirty-eight".