247738789 has 2 divisors, whose sum is σ = 247738790. Its totient is φ = 247738788.

The previous prime is 247738787. The next prime is 247738823. The reversal of 247738789 is 987837742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214388164 + 33350625 = 14642^2 + 5775^2 .

It is a cyclic number.

It is not a de Polignac number, because 247738789 - 2¹ = 247738787 is a prime.

It is a super-2 number, since 2×247738789² = 122749015150373042, which contains 22 as substring.

Together with 247738787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247738783) 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, 123869394 + 123869395.

It is an arithmetic number, because the mean of its divisors is an integer number (123869395).

Almost surely, 2^247738789 is an apocalyptic number.

It is an amenable number.

247738789 is a deficient number, since it is larger than the sum of its proper divisors (1).

247738789 is an equidigital number, since it uses as much as digits as its factorization.

247738789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4741632, while the sum is 55.

The square root of 247738789 is about 15739.7201055165. The cubic root of 247738789 is about 628.0554714885.

It can be divided in two parts, 2477387 and 89, that added together give a square (2477476 = 1574²).

The spelling of 247738789 in words is "two hundred forty-seven million, seven hundred thirty-eight thousand, seven hundred eighty-nine".