49278389 has 2 divisors, whose sum is σ = 49278390. Its totient is φ = 49278388.

The previous prime is 49278377. The next prime is 49278391. The reversal of 49278389 is 98387294.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25170289 + 24108100 = 5017^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 49278389 - 2⁴ = 49278373 is a prime.

Together with 49278391, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49278319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24639194 + 24639195.

It is an arithmetic number, because the mean of its divisors is an integer number (24639195).

Almost surely, 2^49278389 is an apocalyptic number.

It is an amenable number.

49278389 is a deficient number, since it is larger than the sum of its proper divisors (1).

49278389 is an equidigital number, since it uses as much as digits as its factorization.

49278389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 50.

The square root of 49278389 is about 7019.8567649205. The cubic root of 49278389 is about 366.6222630343.

The spelling of 49278389 in words is "forty-nine million, two hundred seventy-eight thousand, three hundred eighty-nine".