2749639 has 2 divisors, whose sum is σ = 2749640. Its totient is φ = 2749638.

The previous prime is 2749609. The next prime is 2749667. The reversal of 2749639 is 9369472.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2749639 - 2⁷ = 2749511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2749609) 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 as a sum of consecutive naturals, namely, 1374819 + 1374820.

It is an arithmetic number, because the mean of its divisors is an integer number (1374820).

2^2749639 is an apocalyptic number.

2749639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2749639 is an equidigital number, since it uses as much as digits as its factorization.

2749639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 40.

The square root of 2749639 is about 1658.2035460100. The cubic root of 2749639 is about 140.0958357421.

The spelling of 2749639 in words is "two million, seven hundred forty-nine thousand, six hundred thirty-nine".