2778349 has 6 divisors (see below), whose sum is σ = 3232014. Its totient is φ = 2381400.

The previous prime is 2778343. The next prime is 2778353. The reversal of 2778349 is 9438772.

It can be written as a sum of positive squares in only one way, i.e., 2502724 + 275625 = 1582^2 + 525^2 .

It is not a de Polignac number, because 2778349 - 2³ = 2778341 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 (2778341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28302 + ... + 28399.

It is an arithmetic number, because the mean of its divisors is an integer number (538669).

2^2778349 is an apocalyptic number.

It is an amenable number.

2778349 is a deficient number, since it is larger than the sum of its proper divisors (453665).

2778349 is an equidigital number, since it uses as much as digits as its factorization.

2778349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56715 (or 56708 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 2778349 is about 1666.8380245243. The cubic root of 2778349 is about 140.5817459728.

The spelling of 2778349 in words is "two million, seven hundred seventy-eight thousand, three hundred forty-nine".