2278729 has 2 divisors, whose sum is σ = 2278730. Its totient is φ = 2278728.

The previous prime is 2278709. The next prime is 2278747. The reversal of 2278729 is 9278722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 304704 = 1405^2 + 552^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278729 - 2⁹ = 2278217 is a prime.

It is not a weakly prime, because it can be changed into another prime (2278709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139364 + 1139365.

It is an arithmetic number, because the mean of its divisors is an integer number (1139365).

2^2278729 is an apocalyptic number.

It is an amenable number.

2278729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278729 is an equidigital number, since it uses as much as digits as its factorization.

2278729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 2278729 is about 1509.5459582272. The cubic root of 2278729 is about 131.5924258782.

The spelling of 2278729 in words is "two million, two hundred seventy-eight thousand, seven hundred twenty-nine".