2678729 has 2 divisors, whose sum is σ = 2678730. Its totient is φ = 2678728.

The previous prime is 2678719. The next prime is 2678737. The reversal of 2678729 is 9278762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2496400 + 182329 = 1580^2 + 427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2678729 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2 + 6³ + 7³ + 8⁵ + 7⁵ + 2²¹ + 9⁶ .

It is not a weakly prime, because it can be changed into another prime (2678719) 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, 1339364 + 1339365.

It is an arithmetic number, because the mean of its divisors is an integer number (1339365).

2^2678729 is an apocalyptic number.

It is an amenable number.

2678729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2678729 is an equidigital number, since it uses as much as digits as its factorization.

2678729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 2678729 is about 1636.6823149286. The cubic root of 2678729 is about 138.8810292678.

The spelling of 2678729 in words is "two million, six hundred seventy-eight thousand, seven hundred twenty-nine".