2778871 has 8 divisors (see below), whose sum is σ = 3037824. Its totient is φ = 2530560.

The previous prime is 2778863. The next prime is 2778877. The reversal of 2778871 is 1788772.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2778871 - 2³ = 2778863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2110 + ... + 3163.

It is an arithmetic number, because the mean of its divisors is an integer number (379728).

2^2778871 is an apocalyptic number.

2778871 is a deficient number, since it is larger than the sum of its proper divisors (258953).

2778871 is a wasteful number, since it uses less digits than its factorization.

2778871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5321.

The product of its digits is 43904, while the sum is 40.

The square root of 2778871 is about 1666.9946010710. The cubic root of 2778871 is about 140.5905496516.

Subtracting from 2778871 its reverse (1788772), we obtain a palindrome (990099).

The spelling of 2778871 in words is "two million, seven hundred seventy-eight thousand, eight hundred seventy-one".