2778829 has 2 divisors, whose sum is σ = 2778830. Its totient is φ = 2778828.

The previous prime is 2778827. The next prime is 2778833. The reversal of 2778829 is 9288772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1444804 + 1334025 = 1202^2 + 1155^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778829 - 2¹ = 2778827 is a prime.

It is a super-2 number, since 2×2778829² = 15443781222482, which contains 22 as substring.

Together with 2778827, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389414 + 1389415.

It is an arithmetic number, because the mean of its divisors is an integer number (1389415).

2^2778829 is an apocalyptic number.

It is an amenable number.

2778829 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778829 is an equidigital number, since it uses as much as digits as its factorization.

2778829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 43.

The square root of 2778829 is about 1666.9820035021. The cubic root of 2778829 is about 140.5898413504.

The spelling of 2778829 in words is "two million, seven hundred seventy-eight thousand, eight hundred twenty-nine".