2774639 has 4 divisors (see below), whose sum is σ = 3171024. Its totient is φ = 2378256.

The previous prime is 2774623. The next prime is 2774669. The reversal of 2774639 is 9364772.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2774639 - 2⁴ = 2774623 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 (2774669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198182 + ... + 198195.

It is an arithmetic number, because the mean of its divisors is an integer number (792756).

2^2774639 is an apocalyptic number.

2774639 is a deficient number, since it is larger than the sum of its proper divisors (396385).

2774639 is an equidigital number, since it uses as much as digits as its factorization.

2774639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396384.

The product of its digits is 63504, while the sum is 38.

The square root of 2774639 is about 1665.7247671809. The cubic root of 2774639 is about 140.5191439743.

The spelling of 2774639 in words is "two million, seven hundred seventy-four thousand, six hundred thirty-nine".