4278949 has 2 divisors, whose sum is σ = 4278950. Its totient is φ = 4278948.

The previous prime is 4278947. The next prime is 4278959. The reversal of 4278949 is 9498724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 338724 = 1985^2 + 582^2 .

It is a cyclic number.

It is not a de Polignac number, because 4278949 - 2¹ = 4278947 is a prime.

Together with 4278947, it forms a pair of twin primes.

It is an Ulam number.

It is a d-powerful number, because it can be written as 4 + 2¹³ + 7⁵ + 8³ + 9² + 4¹¹ + 9⁵ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4278941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139474 + 2139475.

It is an arithmetic number, because the mean of its divisors is an integer number (2139475).

Almost surely, 2^4278949 is an apocalyptic number.

It is an amenable number.

4278949 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278949 is an equidigital number, since it uses as much as digits as its factorization.

4278949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 4278949 is about 2068.5620609496. The cubic root of 4278949 is about 162.3475366826.

The spelling of 4278949 in words is "four million, two hundred seventy-eight thousand, nine hundred forty-nine".