2778619 has 2 divisors, whose sum is σ = 2778620. Its totient is φ = 2778618.

The previous prime is 2778583. The next prime is 2778647. The reversal of 2778619 is 9168772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2778619 - 2⁹ = 2778107 is a prime.

It is a super-2 number, since 2×2778619² = 15441447094322, which contains 22 as substring.

2778619 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2778649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389309 + 1389310.

It is an arithmetic number, because the mean of its divisors is an integer number (1389310).

2^2778619 is an apocalyptic number.

2778619 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778619 is an equidigital number, since it uses as much as digits as its factorization.

2778619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 2778619 is about 1666.9190142295. The cubic root of 2778619 is about 140.5862997374.

The spelling of 2778619 in words is "two million, seven hundred seventy-eight thousand, six hundred nineteen".